Submission #1237858

#	Time	Username	Problem	Language	Result	Execution time	Memory
1237858		tin_le	JJOOII 2 (JOI20_ho_t2)	C++20	Compilation error	0 ms	0 KiB

ho_t2

//████████╗██╗███╗░░██╗  ██╗░░░░░███████╗
//╚══██╔══╝██║████╗░██║  ██║░░░░░██╔════╝
//░░░██║░░░██║██╔██╗██║  ██║░░░░░█████╗░░
//░░░██║░░░██║██║╚████║  ██║░░░░░██╔══╝░░
//░░░██║░░░██║██║░╚███║  ███████╗███████╗
//░░░╚═╝░░░╚═╝╚═╝░░╚══╝  ╚══════╝╚══════╝
//   __________________
//  | ________________ |
//  ||          ____  ||
//  ||   /\    |      ||
//  ||  /__\   |      ||
//  || /    \  |____  ||
//  ||________________||
//  |__________________|
//  \###################\
//   \###################\
//    \        ____       \
//     \_______\___\_______\
// An AC a day keeps the doctor away.

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <cmath>
#include <vector>
#include <set>
#include <map>
#include <unordered_set>
#include <unordered_map>
#include <queue>
#include <ctime>
#include <cassert>
#include <complex>
#include <string>
#include <cstring>
#include <chrono>
#include <random>
#include <bitset>
#include <iomanip>
#include <functional>
#include <numeric>
#include <stack>
#include <array>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
using namespace std;
template<class T> using ordered_set = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
#define vt vector
#define all(x) begin(x), end(x)
#define allr(x) rbegin(x), rend(x)
#define ub upper_bound
#define lb lower_bound
#define db double
#define ld long db
#define ll long long
#define ull unsigned long long
#define vll vt<ll>  
#define vvll vt<vll>
#define pll pair<ll, ll>    
#define vpll vt<pll>
#define vvpll vt<vpll>
#define vc vt<char> 
#define vvc vt<vc>
#define vi vt<int>
#define vvi vt<vi>
#define vvvi vt<vvi>
#define pii pair<int, int>
#define vpii vt<pii>
#define vs vt<string>
#define vvs vt<vs>
#define vb vt<bool>
#define vvb vt<vb>
#define vvpii vt<vpii>
#define vd vt<db>
#define ar(x) array<int, x>
#define var(x) vt<ar(x)>
#define vvar(x) vt<var(x)>
#define al(x) array<ll, x>
#define vall(x) vt<al(x)>
#define vvall(x) vt<vall(x)>
#define mset(m, v) memset(m, v, sizeof(m))
#define pb push_back
#define ff first
#define ss second
#define sv string_view
#define MP make_pair
#define MT make_tuple
#define rsz resize
#define sum(x) (ll)accumulate(all(x), 0LL)
#define srt(x) sort(all(x))
#define srtR(x) sort(allr(x))
#define srtU(x) sort(all(x)), (x).erase(unique(all(x)), (x).end())
#define SORTED(x) is_sorted(all(x))
#define rev(x) reverse(all(x))
#define MAX(a) *max_element(all(a)) 
#define MIN(a) *min_element(all(a))
#define ROTATE(a, p) rotate(begin(a), begin(a) + p, end(a))
#define i128 __int128

//SGT DEFINE
#define lc i * 2 + 1
#define rc i * 2 + 2
#define lp lc, left, middle
#define rp rc, middle + 1, right
#define entireTree 0, 0, n - 1
#define midPoint left + (right - left) / 2
#define pushDown push(i, left, right)
#define iter int i, int left, int right

#define IOS ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)

struct custom {
    static const uint64_t C = 0x9e3779b97f4a7c15; const uint32_t RANDOM = std::chrono::steady_clock::now().time_since_epoch().count();
    size_t operator()(uint64_t x) const { return __builtin_bswap64((x ^ RANDOM) * C); }
    size_t operator()(const std::string& s) const { size_t hash = std::hash<std::string>{}(s); return hash ^ RANDOM; } };
template <class K, class V> using umap = std::unordered_map<K, V, custom>; template <class K> using uset = std::unordered_set<K, custom>;
template<class T> using max_heap = priority_queue<T>;
template<class T> using min_heap = priority_queue<T, vector<T>, greater<T>>;
    
template<typename T, size_t N>
istream& operator>>(istream& is, array<T, N>& arr) {
    for (size_t i = 0; i < N; i++) { is >> arr[i]; } return is;
}

template<typename T, size_t N>
istream& operator>>(istream& is, vector<array<T, N>>& vec) {
    for (auto &arr : vec) { is >> arr; } return is;
}

inline std::ostream& operator<<(std::ostream& os, i128 x) {
    if(x == 0) { os << '0'; return os; } if(x < 0) { os << '-'; x = -x; }
    string s; while (x > 0) { int digit = int(x % 10); s.pb(char('0' + digit)); x /= 10; }
    rev(s); os << s; return os;
}
    
template <typename T1, typename T2>  istream &operator>>(istream& in, pair<T1, T2>& input) {    return in >> input.ff >> input.ss; }
    
template <typename T> istream &operator>>(istream &in, vector<T> &v) { for (auto &el : v) in >> el; return in; }

template<class T>
void output_vector(vt<T>& a, int off_set = 0) {
    int n = a.size();
    for(int i = off_set; i < n; i++) {
        cout << a[i] << (i == n - 1 ? '\n' : ' ');
    }
}

template<typename T, typename Compare>
vi closest_left(const vt<T>& a, Compare cmp) {
    int n = a.size(); vi closest(n); iota(all(closest), 0);
    for (int i = 0; i < n; i++) {
        auto& j = closest[i];
        while(j && cmp(a[i], a[j - 1])) j = closest[j - 1];
    }
    return closest;
}

template<typename T, typename Compare> // auto right = closest_right<int>(a, std::less<int>());
vi closest_right(const vt<T>& a, Compare cmp) {
    int n = a.size(); vi closest(n); iota(all(closest), 0);
    for (int i = n - 1; i >= 0; i--) {
        auto& j = closest[i];
        while(j < n - 1 && cmp(a[i], a[j + 1])) j = closest[j + 1];
    }
    return closest;
}

template<typename T, typename V = string>
vt<pair<T, int>> encode(const V& s) {
    vt<pair<T, int>> seg;
    for(auto& ch : s) {
        if(seg.empty() || ch != seg.back().ff) seg.pb({ch, 1});
        else seg.back().ss++;
    }
    return seg;
}

    
template<typename K, typename V>
auto operator<<(std::ostream &o, const std::map<K, V> &m) -> std::ostream& {
    o << "{"; int i = 0;
    for (const auto &[key, value] : m) { if (i++) o << " , "; o << key << " : " << value; }
    return o << "}";
}

#ifdef LOCAL
#define debug(x...) debug_out(#x, x)
void debug_out(const char* names) { std::cerr << std::endl; }
template <typename T, typename... Args>
void debug_out(const char* names, T value, Args... args) {
    const char* comma = strchr(names, ',');
    std::cerr << "[" << (comma ? std::string(names, comma) : names) << " = " << value << "]";
    if (sizeof...(args)) { std::cerr << ", "; debug_out(comma + 1, args...); }   
    else { std::cerr << std::endl; }
}
template<typename T1, typename T2>
std::ostream& operator<<(std::ostream& o, const std::pair<T1, T2>& p) { return o << "{" << p.ff << " , " << p.ss << "}"; }
auto operator<<(auto &o, const auto &x) -> decltype(end(x), o) {
    o << "{"; int i = 0; for (const auto &e : x) { if (i++) o << " , "; o << e; } return o << "}";
} // remove for leetcode
#include <sys/resource.h>
#include <sys/time.h>
void printMemoryUsage() {
    struct rusage usage;
    getrusage(RUSAGE_SELF, &usage);
    double memoryMB = usage.ru_maxrss / 1024.0;
    cerr << "Memory usage: " << memoryMB << " MB" << "\n";
}

#define startClock clock_t tStart = clock();
#define endClock std::cout << std::fixed << std::setprecision(10) << "\nTime Taken: " << (double)(clock() - tStart) / CLOCKS_PER_SEC << " seconds" << std::endl;
#else
#define debug(...)
#define startClock
#define endClock

#endif
mt19937_64 rng(chrono::steady_clock::now().time_since_epoch().count());

#define eps 1e-9
#define M_PI 3.14159265358979323846
const static string pi = "3141592653589793238462643383279";
const static ll INF = 1LL << 62;
const static int inf = 1e9 + 100;
const static int MK = 20;
const static int MX = 1e5 + 5;
ll gcd(ll a, ll b) { while (b != 0) { ll temp = b; b = a % b; a = temp; } return a; }
ll lcm(ll a, ll b) { return (a / gcd(a, b)) * b; }
ll floor(ll a, ll b) { if(b < 0) a = -a, b = -b; if (a >= 0) return a / b; return a / b - (a % b ? 1 : 0); }
ll ceil(ll a, ll b) { if (b < 0) a = -a, b = -b; if (a >= 0) return (a + b - 1) / b; return a / b; }
int pct(ll x) { return __builtin_popcountll(x); }
ll have_bit(ll x, int b) { return (x >> b) & 1; }
int min_bit(ll x) { return __builtin_ctzll(x); }
int max_bit(ll x) { return 63 - __builtin_clzll(x); } 
const vvi dirs = {{-1, 0}, {1, 0}, {0, -1}, {0, 1}, {1, 1}, {-1, -1}, {1, -1}, {-1, 1}}; // UP, DOWN, LEFT, RIGHT
const vvi knight_dirs = {{-2, -1}, {-2,  1}, {-1, -2}, {-1,  2}, {1, -2}, {1,  2}, {2, -1}, {2,  1}}; // knight dirs
const vc dirChar = {'U', 'D', 'L', 'R'};
int modExpo(ll base, ll exp, ll mod) { ll res = 1; base %= mod; while(exp) { if(exp & 1) res = (res * base) % mod; base = (base * base) % mod; exp >>= 1; } return res; }
ll extended_gcd(ll a, ll b, ll &x, ll &y) { if (b == 0) { x = 1; y = 0; return a; } ll d = extended_gcd(b, a % b, y, x); y -= (a / b) * x; return d; }
int modExpo_on_string(ll a, string exp, int mod) { ll b = 0; for(auto& ch : exp) b = (b * 10 + (ch - '0')) % (mod - 1); return modExpo(a, b, mod); }
ll sum_even_series(ll n) { return (n / 2) * (n / 2 + 1);} 
ll sum_odd_series(ll n) {return n - sum_even_series(n);} // sum of first n odd number is n ^ 2
ll sum_of_square(ll n) { return n * (n + 1) * (2 * n + 1) / 6; } // sum of 1 + 2 * 2 + 3 * 3 + 4 * 4 + ... + n * n
string make_lower(const string& t) { string s = t; transform(all(s), s.begin(), [](unsigned char c) { return tolower(c); }); return s; }
string make_upper(const string&t) { string s = t; transform(all(s), s.begin(), [](unsigned char c) { return toupper(c); }); return s; }
ll sqrt(ll n) { ll t = sqrtl(n); while(t * t < n) t++; while(t * t > n) t--; return t;}
template<typename T> T geometric_sum(ll n, ll k) { return (1 - T(n).pow(k + 1)) / (1 - n); } // return n^1 + n^2 + n^3 + n^4 + n^5 + ... + n^k
template<typename T> T geometric_power(ll p, ll k) { return (T(p).pow(k + 1) - 1) / T(p - 1); } // p^1 + p^2 + p^3 + ... + p^k
bool is_perm(ll sm, ll square_sum, ll len) {return sm == len * (len + 1) / 2 && square_sum == len * (len + 1) * (2 * len + 1) / 6;} // determine if an array is a permutation base on sum and square_sum
bool is_vowel(char c) {return c == 'a' || c == 'e' || c == 'u' || c == 'o' || c == 'i';}

void solve() {
    int n, level; cin >> n >> level;
    string s; cin >> s;
    vi J, O, I;
    for(int i = 0; i < n; i++) {
        if(s[i] == 'J') J.pb(i);
        else if(s[i] == 'O') O.pb(i);
        else I.pb(i);
    }
    int res = inf;
    const int N = J.size(), M = O.size(), K = I.size();
    for(int i = 0; i + level <= N; i++) {
        int j = J[i + level - 1]; 
        int o = int(ub(all(O), j) - begin(O));
        if(o + level <= O) {
            o = O[o + level - 1]; 
            int k = int(ub(all(I), o) - begin(I));
            if(k + level <= K) {
                res = min(res, I[k + level - 1] - J[i] + 1);
            }
        }
    }
    cout << (res >= inf ? -1 : res - level * 3) << '\n';
}

signed main() {
    // careful for overflow, check for long long, use unsigned long long for random generator
    // when mle, look if problem require read in file, typically old problems
    IOS;
    startClock
    //generatePrime();

    int t = 1;
    //cin >> t;
    for(int i = 1; i <= t; i++) {   
        //cout << "Case #" << i << ": ";  
        solve();
    }

    endClock
    #ifdef LOCAL
      printMemoryUsage();
    #endif

    return 0;
}

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Compilation message (stderr)

ho_t2.cpp: In function 'void solve()':
ho_t2.cpp:268:22: error: no match for 'operator<=' (operand types are 'int' and 'std::vector<int>')
  268 |         if(o + level <= O) {
      |            ~~~~~~~~~ ^~ ~
      |              |          |
      |              int        std::vector<int>
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:538:5: note: candidate: 'template<class _IteratorL, class _IteratorR>  requires  three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorR>&)' (reversed)
  538 |     operator<=>(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:538:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::reverse_iterator<_IteratorL>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:1596:5: note: candidate: 'template<class _IteratorL, class _IteratorR>  requires  three_way_comparable_with<_IteratorR, _IteratorL, std::partial_ordering> constexpr std::compare_three_way_result_t<_IteratorL, _IteratorR> std::operator<=>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&)' (reversed)
 1596 |     operator<=>(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:1596:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::move_iterator<_IteratorL>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/basic_string.h:48,
                 from /usr/include/c++/11/string:55,
                 from /usr/include/c++/11/bits/locale_classes.h:40,
                 from /usr/include/c++/11/bits/ios_base.h:41,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/string_view:556:5: note: candidate: 'template<class _CharT, class _Traits> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(std::basic_string_view<_CharT, _Traits>, std::__type_identity_t<std::basic_string_view<_CharT, _Traits> >)' (reversed)
  556 |     operator<=>(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/11/string_view:556:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'std::basic_string_view<_CharT, _Traits>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/string:55,
                 from /usr/include/c++/11/bits/locale_classes.h:40,
                 from /usr/include/c++/11/bits/ios_base.h:41,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/basic_string.h:6276:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&, const _CharT*)' (reversed)
 6276 |     operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/11/bits/basic_string.h:6276:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/functional:54,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from ho_t2.cpp:24:
/usr/include/c++/11/tuple:1557:5: note: candidate: 'template<class ... _Tps, class ... _Ups> constexpr std::common_comparison_category_t<decltype (std::__detail::__synth3way(declval<_Tps&>(), declval<_Ups&>()))...> std::operator<=>(const std::tuple<_Tps ...>&, const std::tuple<_UTypes ...>&)' (reversed)
 1557 |     operator<=>(const tuple<_Tps...>& __t, const tuple<_Ups...>& __u)
      |     ^~~~~~~~
/usr/include/c++/11/tuple:1557:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::tuple<_Tps ...>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/locale_conv.h:41,
                 from /usr/include/c++/11/locale:43,
                 from /usr/include/c++/11/iomanip:43,
                 from ho_t2.cpp:40:
/usr/include/c++/11/bits/unique_ptr.h:895:5: note: candidate: 'template<class _Tp, class _Dp, class _Up, class _Ep>  requires  three_way_comparable_with<typename std::unique_ptr<_Tp, _Dp>::pointer, typename std::unique_ptr<_Up, _Ep>::pointer, std::partial_ordering> std::compare_three_way_result_t<typename std::unique_ptr<_Tp, _Dp>::pointer, typename std::unique_ptr<_Up, _Ep>::pointer> std::operator<=>(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)' (reversed)
  895 |     operator<=>(const unique_ptr<_Tp, _Dp>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/unique_ptr.h:895:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/locale_conv.h:41,
                 from /usr/include/c++/11/locale:43,
                 from /usr/include/c++/11/iomanip:43,
                 from ho_t2.cpp:40:
/usr/include/c++/11/bits/unique_ptr.h:903:5: note: candidate: 'template<class _Tp, class _Dp>  requires  three_way_comparable<typename std::unique_ptr<_Tp, _Dp>::pointer, std::partial_ordering> std::compare_three_way_result_t<typename std::unique_ptr<_Tp, _Dp>::pointer> std::operator<=>(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)' (reversed)
  903 |     operator<=>(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
      |     ^~~~~~~~
/usr/include/c++/11/bits/unique_ptr.h:903:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/shared_ptr.h:53,
                 from /usr/include/c++/11/memory:77,
                 from /usr/include/c++/11/ext/pb_ds/detail/standard_policies.hpp:44,
                 from /usr/include/c++/11/ext/pb_ds/assoc_container.hpp:47,
                 from ho_t2.cpp:45:
/usr/include/c++/11/bits/shared_ptr_base.h:1422:5: note: candidate: 'template<class _Tp, class _Up, __gnu_cxx::_Lock_policy _Lp> std::strong_ordering std::operator<=>(const std::__shared_ptr<_Tp1, _Lp>&, const std::__shared_ptr<_Tp2, _Lp>&)' (reversed)
 1422 |     operator<=>(const __shared_ptr<_Tp, _Lp>& __a,
      |     ^~~~~~~~
/usr/include/c++/11/bits/shared_ptr_base.h:1422:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::__shared_ptr<_Tp1, _Lp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/shared_ptr.h:53,
                 from /usr/include/c++/11/memory:77,
                 from /usr/include/c++/11/ext/pb_ds/detail/standard_policies.hpp:44,
                 from /usr/include/c++/11/ext/pb_ds/assoc_container.hpp:47,
                 from ho_t2.cpp:45:
/usr/include/c++/11/bits/shared_ptr_base.h:1428:5: note: candidate: 'template<class _Tp, __gnu_cxx::_Lock_policy _Lp> std::strong_ordering std::operator<=>(const std::__shared_ptr<_Tp, _Lp>&, std::nullptr_t)' (reversed)
 1428 |     operator<=>(const __shared_ptr<_Tp, _Lp>& __a, nullptr_t) noexcept
      |     ^~~~~~~~
/usr/include/c++/11/bits/shared_ptr_base.h:1428:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::__shared_ptr<_Tp, _Lp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/memory:77,
                 from /usr/include/c++/11/ext/pb_ds/detail/standard_policies.hpp:44,
                 from /usr/include/c++/11/ext/pb_ds/assoc_container.hpp:47,
                 from ho_t2.cpp:45:
/usr/include/c++/11/bits/shared_ptr.h:449:5: note: candidate: 'template<class _Tp, class _Up> std::strong_ordering std::operator<=>(const std::shared_ptr<_Tp>&, const std::shared_ptr<_Tp>&)' (reversed)
  449 |     operator<=>(const shared_ptr<_Tp>& __a,
      |     ^~~~~~~~
/usr/include/c++/11/bits/shared_ptr.h:449:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::shared_ptr<_Tp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/memory:77,
                 from /usr/include/c++/11/ext/pb_ds/detail/standard_policies.hpp:44,
                 from /usr/include/c++/11/ext/pb_ds/assoc_container.hpp:47,
                 from ho_t2.cpp:45:
/usr/include/c++/11/bits/shared_ptr.h:455:5: note: candidate: 'template<class _Tp> std::strong_ordering std::operator<=>(const std::shared_ptr<_Tp>&, std::nullptr_t)' (reversed)
  455 |     operator<=>(const shared_ptr<_Tp>& __a, nullptr_t) noexcept
      |     ^~~~~~~~
/usr/include/c++/11/bits/shared_ptr.h:455:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::shared_ptr<_Tp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:1129:5: note: candidate: 'template<class _IteratorL, class _IteratorR, class _Container> constexpr std::__detail::__synth3way_t<_IteratorR, _IteratorL> __gnu_cxx::operator<=>(const __gnu_cxx::__normal_iterator<_IteratorL, _Container>&, const __gnu_cxx::__normal_iterator<_IteratorR, _Container>&)' (reversed)
 1129 |     operator<=>(const __normal_iterator<_IteratorL, _Container>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:1129:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const __gnu_cxx::__normal_iterator<_IteratorL, _Container>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:64,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_pair.h:473:5: note: candidate: 'template<class _T1, class _T2> constexpr std::common_comparison_category_t<decltype (std::__detail::__synth3way(declval<_T1&>(), declval<_T1&>())), decltype (std::__detail::__synth3way(declval<_T2&>(), declval<_T2&>()))> std::operator<=>(const std::pair<_T1, _T2>&, const std::pair<_T1, _T2>&)' (rewritten)
  473 |     operator<=>(const pair<_T1, _T2>& __x, const pair<_T1, _T2>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_pair.h:473:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::pair<_T1, _T2>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:554:5: note: candidate: 'template<class _Iterator>  requires  three_way_comparable<_Iterator, std::partial_ordering> constexpr std::compare_three_way_result_t<_Iterator, _Iterator> std::operator<=>(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorL>&)' (rewritten)
  554 |     operator<=>(const reverse_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:554:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::reverse_iterator<_IteratorL>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:1655:5: note: candidate: 'template<class _Iterator>  requires  three_way_comparable<_Iterator, std::partial_ordering> constexpr std::compare_three_way_result_t<_Iterator, _Iterator> std::operator<=>(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorL>&)' (rewritten)
 1655 |     operator<=>(const move_iterator<_Iterator>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:1655:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/basic_string.h:48,
                 from /usr/include/c++/11/string:55,
                 from /usr/include/c++/11/bits/locale_classes.h:40,
                 from /usr/include/c++/11/bits/ios_base.h:41,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/string_view:549:5: note: candidate: 'template<class _CharT, class _Traits> constexpr decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(std::basic_string_view<_CharT, _Traits>, std::basic_string_view<_CharT, _Traits>)' (rewritten)
  549 |     operator<=>(basic_string_view<_CharT, _Traits> __x,
      |     ^~~~~~~~
/usr/include/c++/11/string_view:549:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'std::basic_string_view<_CharT, _Traits>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/string:55,
                 from /usr/include/c++/11/bits/locale_classes.h:40,
                 from /usr/include/c++/11/bits/ios_base.h:41,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/basic_string.h:6262:5: note: candidate: 'template<class _CharT, class _Traits, class _Alloc> decltype (__char_traits_cmp_cat<_Traits>(0)) std::operator<=>(const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&, const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>&)' (rewritten)
 6262 |     operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/11/bits/basic_string.h:6262:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::__cxx11::basic_string<_CharT, _Traits, _Allocator>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/tuple:39,
                 from /usr/include/c++/11/functional:54,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from ho_t2.cpp:24:
/usr/include/c++/11/array:282:5: note: candidate: 'template<class _Tp, long unsigned int _Nm> constexpr std::__detail::__synth3way_t<_T1> std::operator<=>(const std::array<_Tp, _Nm>&, const std::array<_Tp, _Nm>&)' (rewritten)
  282 |     operator<=>(const array<_Tp, _Nm>& __a, const array<_Tp, _Nm>& __b)
      |     ^~~~~~~~
/usr/include/c++/11/array:282:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::array<_Tp, _Nm>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/vector:67,
                 from /usr/include/c++/11/functional:62,
                 from /usr/include/c++/11/pstl/glue_algorithm_defs.h:13,
                 from /usr/include/c++/11/algorithm:74,
                 from ho_t2.cpp:24:
/usr/include/c++/11/bits/stl_vector.h:1910:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const std::vector<_Tp, _Alloc>&, const std::vector<_Tp, _Alloc>&)' (rewritten)
 1910 |     operator<=>(const vector<_Tp, _Alloc>& __x, const vector<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_vector.h:1910:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::vector<_Tp, _Alloc>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/set:61,
                 from ho_t2.cpp:27:
/usr/include/c++/11/bits/stl_set.h:1006:5: note: candidate: 'template<class _Key, class _Compare, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const std::set<_Key, _Compare, _Allocator>&, const std::set<_Key, _Compare, _Allocator>&)' (rewritten)
 1006 |     operator<=>(const set<_Key, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_set.h:1006:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::set<_Key, _Compare, _Allocator>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/set:62,
                 from ho_t2.cpp:27:
/usr/include/c++/11/bits/stl_multiset.h:992:5: note: candidate: 'template<class _Key, class _Compare, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const std::multiset<_Key, _Compare, _Allocator>&, const std::multiset<_Key, _Compare, _Allocator>&)' (rewritten)
  992 |     operator<=>(const multiset<_Key, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_multiset.h:992:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::multiset<_Key, _Compare, _Allocator>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/map:61,
                 from ho_t2.cpp:28:
/usr/include/c++/11/bits/stl_map.h:1484:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> std::__detail::__synth3way_t<std::pair<const _Key, _Tp> > std::operator<=>(const std::map<_Key, _Tp, _Compare, _Allocator>&, const std::map<_Key, _Tp, _Compare, _Allocator>&)' (rewritten)
 1484 |     operator<=>(const map<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_map.h:1484:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::map<_Key, _Tp, _Compare, _Allocator>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/map:62,
                 from ho_t2.cpp:28:
/usr/include/c++/11/bits/stl_multimap.h:1149:5: note: candidate: 'template<class _Key, class _Tp, class _Compare, class _Alloc> std::__detail::__synth3way_t<std::pair<const _Key, _Tp> > std::operator<=>(const std::multimap<_Key, _Tp, _Compare, _Allocator>&, const std::multimap<_Key, _Tp, _Compare, _Allocator>&)' (rewritten)
 1149 |     operator<=>(const multimap<_Key, _Tp, _Compare, _Alloc>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_multimap.h:1149:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::multimap<_Key, _Tp, _Compare, _Allocator>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/deque:67,
                 from /usr/include/c++/11/queue:60,
                 from ho_t2.cpp:31:
/usr/include/c++/11/bits/stl_deque.h:2265:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const std::deque<_Tp, _Alloc>&, const std::deque<_Tp, _Alloc>&)' (rewritten)
 2265 |     operator<=>(const deque<_Tp, _Alloc>& __x, const deque<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_deque.h:2265:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::deque<_Tp, _Alloc>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/queue:64,
                 from ho_t2.cpp:31:
/usr/include/c++/11/bits/stl_queue.h:392:5: note: candidate: 'template<class _Tp, class _Seq>  requires  three_way_comparable<_Seq, std::partial_ordering> std::compare_three_way_result_t<_Seq> std::operator<=>(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)' (rewritten)
  392 |     operator<=>(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_queue.h:392:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::queue<_Tp, _Seq>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/stack:61,
                 from ho_t2.cpp:43:
/usr/include/c++/11/bits/stl_stack.h:367:5: note: candidate: 'template<class _Tp, class _Seq>  requires  three_way_comparable<_Seq, std::partial_ordering> std::compare_three_way_result_t<_Seq> std::operator<=>(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)' (rewritten)
  367 |     operator<=>(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_stack.h:367:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::stack<_Tp, _Seq>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/list:63,
                 from /usr/include/c++/11/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:46,
                 from /usr/include/c++/11/ext/pb_ds/detail/container_base_dispatch.hpp:73,
                 from /usr/include/c++/11/ext/pb_ds/assoc_container.hpp:48,
                 from ho_t2.cpp:45:
/usr/include/c++/11/bits/stl_list.h:2065:5: note: candidate: 'template<class _Tp, class _Alloc> std::__detail::__synth3way_t<_T1> std::operator<=>(const std::__cxx11::list<_Tp, _Alloc>&, const std::__cxx11::list<_Tp, _Alloc>&)' (rewritten)
 2065 |     operator<=>(const list<_Tp, _Alloc>& __x, const list<_Tp, _Alloc>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_list.h:2065:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::__cxx11::list<_Tp, _Alloc>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:1146:5: note: candidate: 'template<class _Iterator, class _Container> constexpr std::__detail::__synth3way_t<_T1> __gnu_cxx::operator<=>(const __gnu_cxx::__normal_iterator<_Iterator, _Container>&, const __gnu_cxx::__normal_iterator<_Iterator, _Container>&)' (rewritten)
 1146 |     operator<=>(const __normal_iterator<_Iterator, _Container>& __lhs,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:1146:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const __gnu_cxx::__normal_iterator<_Iterator, _Container>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/ios_base.h:46,
                 from /usr/include/c++/11/ios:42,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/system_error:261:3: note: candidate: 'std::strong_ordering std::operator<=>(const std::error_code&, const std::error_code&)' (rewritten)
  261 |   operator<=>(const error_code& __lhs, const error_code& __rhs) noexcept
      |   ^~~~~~~~
/usr/include/c++/11/system_error:261:33: note:   no known conversion for argument 1 from 'int' to 'const std::error_code&'
  261 |   operator<=>(const error_code& __lhs, const error_code& __rhs) noexcept
      |               ~~~~~~~~~~~~~~~~~~^~~~~
/usr/include/c++/11/system_error:387:3: note: candidate: 'std::strong_ordering std::operator<=>(const std::error_condition&, const std::error_condition&)' (rewritten)
  387 |   operator<=>(const error_condition& __lhs,
      |   ^~~~~~~~
/usr/include/c++/11/system_error:387:38: note:   no known conversion for argument 1 from 'int' to 'const std::error_condition&'
  387 |   operator<=>(const error_condition& __lhs,
      |               ~~~~~~~~~~~~~~~~~~~~~~~^~~~~
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:523:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<=(const std::reverse_iterator<_IteratorL>&, const std::reverse_iterator<_IteratorR>&) requires requires{{std::operator<=::__x->base() >= std::operator<=::__y->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
  523 |     operator<=(const reverse_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:523:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::reverse_iterator<_IteratorL>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/stl_algobase.h:67,
                 from /usr/include/c++/11/bits/char_traits.h:39,
                 from /usr/include/c++/11/ios:40,
                 from /usr/include/c++/11/ostream:38,
                 from /usr/include/c++/11/iostream:39,
                 from ho_t2.cpp:21:
/usr/include/c++/11/bits/stl_iterator.h:1618:5: note: candidate: 'template<class _IteratorL, class _IteratorR> constexpr bool std::operator<=(const std::move_iterator<_IteratorL>&, const std::move_iterator<_IteratorR>&) requires requires{{std::operator<=::__y->base() < std::operator<=::__x->base()} -> decltype(auto) [requires std::convertible_to<<placeholder>, bool>];}'
 1618 |     operator<=(const move_iterator<_IteratorL>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_iterator.h:1618:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::move_iterator<_IteratorL>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/queue:64,
                 from ho_t2.cpp:31:
/usr/include/c++/11/bits/stl_queue.h:380:5: note: candidate: 'template<class _Tp, class _Seq> bool std::operator<=(const std::queue<_Tp, _Seq>&, const std::queue<_Tp, _Seq>&)'
  380 |     operator<=(const queue<_Tp, _Seq>& __x, const queue<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_queue.h:380:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::queue<_Tp, _Seq>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/locale_conv.h:41,
                 from /usr/include/c++/11/locale:43,
                 from /usr/include/c++/11/iomanip:43,
                 from ho_t2.cpp:40:
/usr/include/c++/11/bits/unique_ptr.h:826:5: note: candidate: 'template<class _Tp, class _Dp, class _Up, class _Ep> bool std::operator<=(const std::unique_ptr<_Tp, _Dp>&, const std::unique_ptr<_Up, _Ep>&)'
  826 |     operator<=(const unique_ptr<_Tp, _Dp>& __x,
      |     ^~~~~~~~
/usr/include/c++/11/bits/unique_ptr.h:826:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::unique_ptr<_Tp, _Dp>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/locale_conv.h:41,
                 from /usr/include/c++/11/locale:43,
                 from /usr/include/c++/11/iomanip:43,
                 from ho_t2.cpp:40:
/usr/include/c++/11/bits/unique_ptr.h:833:5: note: candidate: 'template<class _Tp, class _Dp> bool std::operator<=(const std::unique_ptr<_Tp, _Dp>&, std::nullptr_t)'
  833 |     operator<=(const unique_ptr<_Tp, _Dp>& __x, nullptr_t)
      |     ^~~~~~~~
/usr/include/c++/11/bits/unique_ptr.h:833:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::unique_ptr<_Tp, _Dp>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/bits/locale_conv.h:41,
                 from /usr/include/c++/11/locale:43,
                 from /usr/include/c++/11/iomanip:43,
                 from ho_t2.cpp:40:
/usr/include/c++/11/bits/unique_ptr.h:839:5: note: candidate: 'template<class _Tp, class _Dp> bool std::operator<=(std::nullptr_t, const std::unique_ptr<_Tp, _Dp>&)'
  839 |     operator<=(nullptr_t, const unique_ptr<_Tp, _Dp>& __x)
      |     ^~~~~~~~
/usr/include/c++/11/bits/unique_ptr.h:839:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   'std::vector<int>' is not derived from 'const std::unique_ptr<_Tp, _Dp>'
  268 |         if(o + level <= O) {
      |                         ^
In file included from /usr/include/c++/11/stack:61,
                 from ho_t2.cpp:43:
/usr/include/c++/11/bits/stl_stack.h:355:5: note: candidate: 'template<class _Tp, class _Seq> bool std::operator<=(const std::stack<_Tp, _Seq>&, const std::stack<_Tp, _Seq>&)'
  355 |     operator<=(const stack<_Tp, _Seq>& __x, const stack<_Tp, _Seq>& __y)
      |     ^~~~~~~~
/usr/include/c++/11/bits/stl_stack.h:355:5: note:   template argument deduction/substitution failed:
ho_t2.cpp:268:25: note:   mismatched types 'const std::stack<_Tp, _Seq>' and 'int'
  268 |         if(o + level <= O) {
      |                         ^