Submission #63129

#	Time	Username	Problem	Language	Result	Execution time	Memory
63129		qkxwsm	Three Friends (BOI14_friends)	C++17	Compilation error	0 ms	0 KiB

friends

/*
PROG: source
LANG: C++11
    _____
  .'     '.
 /  0   0  \
|     ^     |
|  \     /  |
 \  '---'  /
  '._____.'
*/
#include <bits/stdc++.h>
#include <ext/pb_ds/tree_policy.hpp>
#include <ext/pb_ds/assoc_container.hpp>

using namespace std;
using namespace __gnu_pbds;

struct chash
{
        int operator()(int x) const
        {
                x ^= (x >> 20) ^ (x >> 12);
                return x ^ (x >> 7) ^ (x >> 4);
        }
        int operator()(long long x) const
        {
                return x ^ (x >> 32);
        }
};

template<typename T> using orderedset = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
template<typename T, typename U> using hashtable = gp_hash_table<T, U, chash>;

template<class T>
void readi(T &x)
{
	T input = 0;
	bool negative = false;
	char c = ' ';
	while (c < '-')
        {
		c = getchar();
	}
	if (c == '-')
	{
		negative = true;
		c = getchar();
	}
	while (c >= '0')
	{
		input = input * 10 + (c - '0');
		c = getchar();
	}
	if (negative)
	{
		input = -input;
	}
	x = input;
}
template<class T>
void printi(T output)
{
	if (output == 0)
	{
		putchar('0');
		return;
	}
	if (output < 0)
	{
		putchar('-');
		output = -output;
	}
	int aout[20];
	int ilen = 0;
	while(output)
	{
		aout[ilen] = ((output % 10));
		output /= 10;
		ilen++;
	}
	for (int i = ilen - 1; i >= 0; i--)
	{
		putchar(aout[i] + '0');
	}
	return;
}
template<class T>
void ckmin(T &a, T b)
{
	a = min(a, b);
}
template<class T>
void ckmax(T &a, T b)
{
	a = max(a, b);
}
template<class T, class U>
T normalize(T x, U mod = 1000000007)
{
	return (((x % mod) + mod) % mod);
}
long long randomizell(long long mod)
{
	return ((1ll << 45) * rand() + (1ll << 30) * rand() + (1ll << 15) * rand() + rand()) % mod;
}
int randomize(int mod)
{
	return ((1ll << 15) * rand() + rand()) % mod;
}

#define y0 ___y0
#define y1 ___y1
#define MP make_pair
#define MT make_tuple
#define PB push_back
#define PF push_front
#define LB lower_bound
#define UB upper_bound
#define fi first
#define se second
#define debug(x) cerr << #x << " = " << x << endl;

const long double PI = 4.0 * atan(1.0);
const long double EPS = 1e-10;

#define MAGIC 347
#define SINF 10007
#define CO 1000007
#define INF 1000000007
#define BIG 1000000931
#define LARGE 1696969696967ll
#define GIANT 2564008813937411ll
#define LLINF 2696969696969696969ll
#define MAXN 2000013

typedef __int128_t ll;
typedef long double ld;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
typedef pair<ld, ld> pdd;

int N;
int arr[MAXN];
pll pw[MAXN];
pll pref[MAXN];
unordered_map<ll, int> hashes;
int res = -1;

ll getpw(ll a, ll e, ll mod)
{
        if (e == 1)
        {
                return a;
        }
        ll was = getpw(a, e / 2, mod);
        if (e % 2)
        {
                return was * was % mod * a % mod;
        }
        else
        {
                return was * was % mod;
        }
}
ll modinv(ll a, ll mod)
{
        return getpw(a, mod - 2, mod);
}
pll gethash(int l, int r)
{
        pll res = {pref[r + 1].fi - pref[l].fi * pw[r - l + 1].fi, pref[r + 1].se - pref[l].se * pw[r - l + 1].se};
        res.fi = normalize(res.fi, INF);
        res.se = normalize(res.se, BIG);
        return res;
}

int32_t main()
{
	// ios_base::sync_with_stdio(0);
	srand(time(0));
	//	cout << fixed << setprecision(10);
	//	cerr << fixed << setprecision(10);
	if (fopen("input.in", "r"))
	{
		freopen ("input.in", "r", stdin);
		freopen ("output.out", "w", stdout);
	}
        // N = 1999999;
        readi(N);
        if (N % 2 == 0)
        {
                puts("NOT POSSIBLE\n");
                return 0;
        }
        for (int i = 0; i < N; i++)
        {
                char c = getchar();
                // char c = 'A';
                arr[i] = c - 'A' + 1;
        }
        pw[0] = {1, 1};
        for (int i = 1; i <= N; i++)
        {
                pw[i].fi = pw[i - 1].fi * CO;
                pw[i].fi %= INF;
                pw[i].se = pw[i - 1].se * CO;
                pw[i].se %= BIG;
        }
        pref[0] = {0, 0};
        for (int i = 0; i < N; i++)
        {
                pref[i + 1].fi = pref[i].fi * CO + arr[i];
                pref[i + 1].fi %= INF;
                pref[i + 1].se = pref[i].se * CO + arr[i];
                pref[i + 1].se %= BIG;
        }
        for (int i = 0; i <= (N + 1) / 2; i++)
        {
                pll go = gethash(i, i + (N / 2) - 1);
                go.fi *= (pw[N / 2].fi + 1); go.fi %= INF;
                go.se *= (pw[N / 2].se + 1); go.se %= BIG;
                hashes[go.fi * INF + go.se] = i;
        }
        for (int i = 0; i < N; i++)
        {
                //remove i
                pll cur = {0, 0};
                cur.fi = (gethash(0, i - 1).fi * pw[N - i - 1].fi + gethash(i + 1, N - 1).fi) % INF;
                cur.se = (gethash(0, i - 1).se * pw[N - i - 1].se + gethash(i + 1, N - 1).se) % BIG;
                if (hashes.find(cur.fi * INF + cur.se) == hashes.end())
                {
                        continue;
                }
                int pos = hashes[cur.fi * INF + cur.se];
                if (res != -1 && pos != res && pos != 0)
                {
                        puts("NOT UNIQUE");
                        return 0;
                }
                res = pos;
        }
        if (res == -1)
        {
                puts("NOT POSSIBLE");
                return 0;
        }
        for (int i = res; i < res + (N / 2); i++)
        {
                putchar((char) (arr[i] + 'A' - 1));
        }
        putchar('\n');
	// cerr << "time elapsed = " << (clock() / (CLOCKS_PER_SEC / 1000)) << " ms" << endl;
	return 0;
}

Compilation message (stderr)

In file included from /usr/include/c++/7/bits/hashtable.h:35:0,
                 from /usr/include/c++/7/unordered_map:47,
                 from /usr/include/c++/7/functional:60,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:71,
                 from friends.cpp:12:
/usr/include/c++/7/bits/hashtable_policy.h: In instantiation of 'struct std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> >':
/usr/include/c++/7/type_traits:143:12:   required from 'struct std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > >'
/usr/include/c++/7/type_traits:154:31:   required from 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
/usr/include/c++/7/bits/unordered_map.h:103:66:   required from 'class std::unordered_map<__int128, int>'
friends.cpp:147:24:   required from here
/usr/include/c++/7/bits/hashtable_policy.h:87:34: error: no match for call to '(const std::hash<__int128>) (const __int128&)'
  noexcept(declval<const _Hash&>()(declval<const _Key&>()))>
           ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/bits/move.h:54:0,
                 from /usr/include/c++/7/bits/stl_pair.h:59,
                 from /usr/include/c++/7/bits/stl_algobase.h:64,
                 from /usr/include/c++/7/bits/specfun.h:45,
                 from /usr/include/c++/7/cmath:1914,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:41,
                 from friends.cpp:12:
/usr/include/c++/7/type_traits: In instantiation of 'struct std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >':
/usr/include/c++/7/bits/unordered_map.h:103:66:   required from 'class std::unordered_map<__int128, int>'
friends.cpp:147:24:   required from here
/usr/include/c++/7/type_traits:154:31: error: 'value' is not a member of 'std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > >'
     : public __bool_constant<!bool(_Pp::value)>
                               ^~~~~~~~~~~~~~~~
In file included from /usr/include/c++/7/unordered_map:48:0,
                 from /usr/include/c++/7/functional:60,
                 from /usr/include/x86_64-linux-gnu/c++/7/bits/stdc++.h:71,
                 from friends.cpp:12:
/usr/include/c++/7/bits/unordered_map.h: In instantiation of 'class std::unordered_map<__int128, int>':
friends.cpp:147:24:   required from here
/usr/include/c++/7/bits/unordered_map.h:103:66: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef __umap_hashtable<_Key, _Tp, _Hash, _Pred, _Alloc>  _Hashtable;
                                                                  ^~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:110:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::key_type key_type;
                                             ^~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:111:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::value_type value_type;
                                               ^~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:112:48: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::mapped_type mapped_type;
                                                ^~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:113:43: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::hasher hasher;
                                           ^~~~~~
/usr/include/c++/7/bits/unordered_map.h:114:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::key_equal key_equal;
                                              ^~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:115:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::allocator_type allocator_type;
                                                   ^~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:120:45: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::pointer  pointer;
                                             ^~~~~~~
/usr/include/c++/7/bits/unordered_map.h:121:50: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::const_pointer const_pointer;
                                                  ^~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:122:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::reference  reference;
                                               ^~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:123:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::const_reference const_reference;
                                                    ^~~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:124:46: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::iterator  iterator;
                                              ^~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:125:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::const_iterator const_iterator;
                                                   ^~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:126:51: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::local_iterator local_iterator;
                                                   ^~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:127:57: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::const_local_iterator const_local_iterator;
                                                         ^~~~~~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:128:47: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::size_type  size_type;
                                               ^~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:129:52: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       typedef typename _Hashtable::difference_type difference_type;
                                                    ^~~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:133:55: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       using node_type = typename _Hashtable::node_type;
                                                       ^
/usr/include/c++/7/bits/unordered_map.h:134:73: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       using insert_return_type = typename _Hashtable::insert_return_type;
                                                                         ^
/usr/include/c++/7/bits/unordered_map.h:288:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       operator=(initializer_list<value_type> __l)
       ^~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:386:2: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
  emplace(_Args&&... __args)
  ^~~~~~~
/usr/include/c++/7/bits/unordered_map.h:469:9: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
         try_emplace(const key_type& __k, _Args&&... __args)
         ^~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:487:9: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
         try_emplace(key_type&& __k, _Args&&... __args)
         ^~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:578:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       insert(const value_type& __x)
       ^~~~~~
/usr/include/c++/7/bits/unordered_map.h:584:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       insert(value_type&& __x)
       ^~~~~~
/usr/include/c++/7/bits/unordered_map.h:591:2: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
  insert(_Pair&& __x)
  ^~~~~~
/usr/include/c++/7/bits/unordered_map.h:657:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       insert(initializer_list<value_type> __l)
       ^~~~~~
/usr/include/c++/7/bits/unordered_map.h:685:9: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
         insert_or_assign(const key_type& __k, _Obj&& __obj)
         ^~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:703:9: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
         insert_or_assign(key_type&& __k, _Obj&& __obj)
         ^~~~~~~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:953:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       equal_range(const key_type& __x)
       ^~~~~~~~~~~
/usr/include/c++/7/bits/unordered_map.h:957:7: error: 'value' is not a member of 'std::__not_<std::__and_<std::__is_fast_hash<std::hash<__int128> >, std::__detail::__is_noexcept_hash<__int128, std::hash<__int128> > > >'
       equal_range(const key_type& __x) const
       ^~~~~~~~~~~
friends.cpp: In function 'int32_t main()':
friends.cpp:223:23: error: no match for 'operator[]' (operand types are 'std::unordered_map<__int128, int>' and '__int128')
                 hashes[go.fi * INF + go.se] = i;
                       ^
friends.cpp:231:28: error: 'class std::unordered_map<__int128, int>' has no member named 'find'
                 if (hashes.find(cur.fi * INF + cur.se) == hashes.end())
                            ^~~~
friends.cpp:231:66: error: 'class std::unordered_map<__int128, int>' has no member named 'end'
                 if (hashes.find(cur.fi * INF + cur.se) == hashes.end())
                                                                  ^~~
friends.cpp:235:33: error: no match for 'operator[]' (operand types are 'std::unordered_map<__int128, int>' and '__int128')
                 int pos = hashes[cur.fi * INF + cur.se];
                                 ^
friends.cpp:186:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("input.in", "r", stdin);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
friends.cpp:187:11: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   freopen ("output.out", "w", stdout);
   ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~