Submission #765317

#	Time	Username	Problem	Language	Result	Execution time	Memory
765317		PanosPask	Zamjene (COCI16_zamjene)	C++14	Compilation error	0 ms	0 KiB

zamjene

#include <bits/stdc++.h>
#define POSITIVE_M(v) (v = ((v%MOD) + MOD) % MOD)

using namespace std;

// typedef long long ll;
typedef __int128_t ll;
typedef __int128_t lll;

const ll MOD = (1ll << 61) - 1;
const int PRIME = 3;

int n, Q;
vector<int> a;
vector<ll> pos_v;
vector<ll> num_v;

// DSU variables
vector<ll> total_pos, total_num;
vector<int> rep;
vector<int> sz;
unordered_map<ll, int> diff_looking;

ll q4ans = 0;

int find(int a)
{
    if (rep[a] != a)
        rep[a] = find(rep[a]);

    return rep[a];
}

void remove_option(int a)
{
    a = find(a);


    ll diff = total_num[a] - total_pos[a];
    POSITIVE_M(diff);

    if (diff == 0)
        return;

    int v = diff_looking[diff];
    if (v == sz[a])
        diff_looking.erase(diff);
    else
        diff_looking[diff] -= sz[a];

    ll rev = -diff;
    POSITIVE_M(rev);

    if (diff_looking.find(rev) != diff_looking.end()) {
        int b = diff_looking[rev];

        q4ans -= (ll)b * sz[a];
    }
}

void add_option(int a)
{
    a = find(a);

    ll diff = total_num[a] - total_pos[a];
    POSITIVE_M(diff);
    if (diff == 0)
        return;

    diff_looking[diff] += sz[a];

    ll rev = -diff;
    POSITIVE_M(rev);

    if (diff_looking.find(rev) != diff_looking.end()) {
        int b = diff_looking[rev];

        q4ans += (ll)sz[a] * b;
    }
}

void init(void)
{
    rep.resize(n);
    sz.assign(n, 1);

    total_pos.resize(n);
    total_num.resize(n);

    for (int i = 0; i < n; i++) {
        rep[i] = i;
        total_pos[i] = pos_v[i];
        total_num[i] = num_v[a[i]];

        add_option(i);
    }
}

void unite(int a, int b)
{
    a = find(a);
    b = find(b);

    if (a == b)
        return;

    if (sz[b] > sz[a])
        swap(a, b);

    remove_option(a);
    remove_option(b);

    rep[b] = a;
    sz[a] += sz[b];

    total_num[a] += total_num[b];
    POSITIVE_M(total_num[a]);
    total_pos[a] += total_pos[b];
    POSITIVE_M(total_pos[a]);

    add_option(a);
}

void change_to(int a, int p_v, int n_v)
{
    a = find(a);

    remove_option(a);

    total_num[a] += num_v[n_v] - num_v[p_v];
    POSITIVE_M(total_num[a]);

    add_option(a);
}

ll bigger_rand(void)
{
    ll a = rand();
    ll b = rand();

    ll res = (a * RAND_MAX) + b;

    return res;
}

int main(void)
{
    scanf("%d %d", &n, &Q);

    num_v.assign(1e6 + 1, -1);
    pos_v.resize(n);
    a.resize(n);
    for (int i = 0; i < n; i++) {
        scanf("%d", &a[i]);
    }

    srand(42);

    vector<int> s_a = a;
    sort(s_a.begin(), s_a.end());

    for (int i = 0; i < n; i++) {
        if (num_v[s_a[i]] == -1) {
            num_v[s_a[i]] = bigger_rand() % MOD;
            POSITIVE_M(num_v[s_a[i]]);
        }


        pos_v[i] = num_v[s_a[i]];
    }

    init();

    while (Q--) {
        int op;
        scanf("%d", &op);

        if (op == 1) {
            int p1, p2;
            scanf("%d %d", &p1, &p2);
            p1--; p2--;

            change_to(p1, a[p1], a[p2]);
            change_to(p2, a[p2], a[p1]);

            swap(a[p1], a[p2]);
        }
        else if (op == 2) {
            int p1, p2;
            scanf("%d %d", &p1, &p2);
            p1--; p2--;

            unite(p1, p2);
        }
        else if (op == 3) {
            if (diff_looking.size())
                printf("NE\n");
            else
                printf("DA\n");
        }
        else {
            printf("%lld\n", (long long)q4ans);
        }
    }

    return 0;
}

Compilation message (stderr)

zamjene.cpp:22:24: error: use of deleted function 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = __int128; _Tp = int; _Hash = std::hash<__int128>; _Pred = std::equal_to<__int128>; _Alloc = std::allocator<std::pair<const __int128, int> >]'
   22 | unordered_map<ll, int> diff_looking;
      |                        ^~~~~~~~~~~~
In file included from /usr/include/c++/10/unordered_map:47,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/unordered_map.h:141:7: note: 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::unordered_map() [with _Key = __int128; _Tp = int; _Hash = std::hash<__int128>; _Pred = std::equal_to<__int128>; _Alloc = std::allocator<std::pair<const __int128, int> >]' is implicitly deleted because the default definition would be ill-formed:
  141 |       unordered_map() = default;
      |       ^~~~~~~~~~~~~
/usr/include/c++/10/bits/unordered_map.h:141:7: error: use of deleted function 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = __int128; _Value = std::pair<const __int128, int>; _Alloc = std::allocator<std::pair<const __int128, int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]'
In file included from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable.h:451:7: note: 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::_Hashtable() [with _Key = __int128; _Value = std::pair<const __int128, int>; _Alloc = std::allocator<std::pair<const __int128, int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]' is implicitly deleted because the default definition would be ill-formed:
  451 |       _Hashtable() = default;
      |       ^~~~~~~~~~
/usr/include/c++/10/bits/hashtable.h:451:7: error: use of deleted function 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = __int128; _Value = std::pair<const __int128, int>; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]'
In file included from /usr/include/c++/10/bits/hashtable.h:35,
                 from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable_policy.h:1791:5: note: 'std::__detail::_Hashtable_base<_Key, _Value, _ExtractKey, _Equal, _H1, _H2, _Hash, _Traits>::_Hashtable_base() [with _Key = __int128; _Value = std::pair<const __int128, int>; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _Traits = std::__detail::_Hashtable_traits<true, false, true>]' is implicitly deleted because the default definition would be ill-formed:
 1791 |     _Hashtable_base() = default;
      |     ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1791:5: error: use of deleted function 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = __int128; _Value = std::pair<const __int128, int>; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing]'
/usr/include/c++/10/bits/hashtable_policy.h:1368:7: note: 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_Hash_code_base() [with _Key = __int128; _Value = std::pair<const __int128, int>; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing]' is implicitly deleted because the default definition would be ill-formed:
 1368 |       _Hash_code_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1368:7: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<__int128>]'
/usr/include/c++/10/bits/hashtable_policy.h:1112:7: note: 'std::__detail::_Hashtable_ebo_helper<_Nm, _Tp, true>::_Hashtable_ebo_helper() [with int _Nm = 1; _Tp = std::hash<__int128>]' is implicitly deleted because the default definition would be ill-formed:
 1112 |       _Hashtable_ebo_helper() = default;
      |       ^~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1112:7: error: use of deleted function 'std::hash<__int128>::hash()'
In file included from /usr/include/c++/10/bits/basic_string.h:6787,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/functional_hash.h:101:12: note: 'std::hash<__int128>::hash()' is implicitly deleted because the default definition would be ill-formed:
  101 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/10/bits/functional_hash.h:101:12: error: no matching function for call to 'std::__hash_enum<__int128, false>::__hash_enum()'
/usr/include/c++/10/bits/functional_hash.h:82:7: note: candidate: 'std::__hash_enum<_Tp, <anonymous> >::__hash_enum(std::__hash_enum<_Tp, <anonymous> >&&) [with _Tp = __int128; bool <anonymous> = false]'
   82 |       __hash_enum(__hash_enum&&);
      |       ^~~~~~~~~~~
/usr/include/c++/10/bits/functional_hash.h:82:7: note:   candidate expects 1 argument, 0 provided
/usr/include/c++/10/bits/functional_hash.h:101:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = __int128; bool <anonymous> = false]' is private within this context
  101 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/10/bits/functional_hash.h:83:7: note: declared private here
   83 |       ~__hash_enum();
      |       ^
In file included from /usr/include/c++/10/bits/hashtable.h:35,
                 from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable_policy.h:1112:7: error: use of deleted function 'std::hash<__int128>::~hash()'
 1112 |       _Hashtable_ebo_helper() = default;
      |       ^~~~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/10/bits/basic_string.h:6787,
                 from /usr/include/c++/10/string:55,
                 from /usr/include/c++/10/bits/locale_classes.h:40,
                 from /usr/include/c++/10/bits/ios_base.h:41,
                 from /usr/include/c++/10/ios:42,
                 from /usr/include/c++/10/istream:38,
                 from /usr/include/c++/10/sstream:38,
                 from /usr/include/c++/10/complex:45,
                 from /usr/include/c++/10/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:54,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/functional_hash.h:101:12: note: 'std::hash<__int128>::~hash()' is implicitly deleted because the default definition would be ill-formed:
  101 |     struct hash : __hash_enum<_Tp>
      |            ^~~~
/usr/include/c++/10/bits/functional_hash.h:101:12: error: 'std::__hash_enum<_Tp, <anonymous> >::~__hash_enum() [with _Tp = __int128; bool <anonymous> = false]' is private within this context
/usr/include/c++/10/bits/functional_hash.h:83:7: note: declared private here
   83 |       ~__hash_enum();
      |       ^
In file included from /usr/include/c++/10/bits/hashtable.h:35,
                 from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable_policy.h:1368:7: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<1, std::hash<__int128>, true>::~_Hashtable_ebo_helper()'
 1368 |       _Hash_code_base() = default;
      |       ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1109:12: note: 'std::__detail::_Hashtable_ebo_helper<1, std::hash<__int128>, true>::~_Hashtable_ebo_helper()' is implicitly deleted because the default definition would be ill-formed:
 1109 |     struct _Hashtable_ebo_helper<_Nm, _Tp, true>
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1109:12: error: use of deleted function 'std::hash<__int128>::~hash()'
/usr/include/c++/10/bits/hashtable_policy.h:1791:5: error: use of deleted function 'std::__detail::_Hash_code_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()'
 1791 |     _Hashtable_base() = default;
      |     ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1341:12: note: 'std::__detail::_Hash_code_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()' is implicitly deleted because the default definition would be ill-formed:
 1341 |     struct _Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2,
      |            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 1342 |       _Default_ranged_hash, true>
      |       ~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1341:12: error: use of deleted function 'std::__detail::_Hashtable_ebo_helper<1, std::hash<__int128>, true>::~_Hashtable_ebo_helper()'
In file included from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable.h:451:7: error: use of deleted function 'std::__detail::_Hashtable_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::equal_to<__int128>, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()'
  451 |       _Hashtable() = default;
      |       ^~~~~~~~~~
In file included from /usr/include/c++/10/bits/hashtable.h:35,
                 from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable_policy.h:1725:10: note: 'std::__detail::_Hashtable_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::equal_to<__int128>, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()' is implicitly deleted because the default definition would be ill-formed:
 1725 |   struct _Hashtable_base
      |          ^~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1725:10: error: use of deleted function 'std::__detail::_Hash_code_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, true>::~_Hash_code_base()'
/usr/include/c++/10/bits/hashtable_policy.h: In instantiation of 'std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::__hash_code std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::_M_hash_code(const _Key&) const [with _Key = __int128; _Value = std::pair<const __int128, int>; _ExtractKey = std::__detail::_Select1st; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; std::__detail::_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, std::__detail::_Default_ranged_hash, true>::__hash_code = long unsigned int]':
/usr/include/c++/10/bits/hashtable_policy.h:707:45:   required from 'std::__detail::_Map_base<_Key, _Pair, _Alloc, std::__detail::_Select1st, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::mapped_type& std::__detail::_Map_base<_Key, _Pair, _Alloc, std::__detail::_Select1st, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::operator[](const key_type&) [with _Key = __int128; _Pair = std::pair<const __int128, int>; _Alloc = std::allocator<std::pair<const __int128, int> >; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>; std::__detail::_Map_base<_Key, _Pair, _Alloc, std::__detail::_Select1st, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::mapped_type = int; std::__detail::_Map_base<_Key, _Pair, _Alloc, std::__detail::_Select1st, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits, true>::key_type = __int128]'
/usr/include/c++/10/bits/unordered_map.h:984:20:   required from 'std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::mapped_type& std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::operator[](const key_type&) [with _Key = __int128; _Tp = int; _Hash = std::hash<__int128>; _Pred = std::equal_to<__int128>; _Alloc = std::allocator<std::pair<const __int128, int> >; std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::mapped_type = int; std::unordered_map<_Key, _Tp, _Hash, _Pred, _Alloc>::key_type = __int128]'
zamjene.cpp:45:30:   required from here
/usr/include/c++/10/bits/hashtable_policy.h:1377:16: error: static assertion failed: hash function must be invocable with an argument of key type
 1377 |  static_assert(__is_invocable<const _H1&, const _Key&>{},
      |                ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
/usr/include/c++/10/bits/hashtable_policy.h:1379:16: error: no match for call to '(const std::hash<__int128>) (const __int128&)'
 1379 |  return _M_h1()(__k);
      |         ~~~~~~~^~~~~
In file included from /usr/include/c++/10/unordered_map:46,
                 from /usr/include/x86_64-linux-gnu/c++/10/bits/stdc++.h:117,
                 from zamjene.cpp:1:
/usr/include/c++/10/bits/hashtable.h: In instantiation of 'std::_Hashtable<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash, _RehashPolicy, _Traits>::~_Hashtable() [with _Key = __int128; _Value = std::pair<const __int128, int>; _Alloc = std::allocator<std::pair<const __int128, int> >; _ExtractKey = std::__detail::_Select1st; _Equal = std::equal_to<__int128>; _H1 = std::hash<__int128>; _H2 = std::__detail::_Mod_range_hashing; _Hash = std::__detail::_Default_ranged_hash; _RehashPolicy = std::__detail::_Prime_rehash_policy; _Traits = std::__detail::_Hashtable_traits<true, false, true>]':
/usr/include/c++/10/bits/unordered_map.h:102:11:   required from here
/usr/include/c++/10/bits/hashtable.h:1389:5: error: use of deleted function 'std::__detail::_Hashtable_base<__int128, std::pair<const __int128, int>, std::__detail::_Select1st, std::equal_to<__int128>, std::hash<__int128>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Hashtable_traits<true, false, true> >::~_Hashtable_base()'
 1389 |     }
      |     ^
zamjene.cpp: In function 'int main()':
zamjene.cpp:148:10: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  148 |     scanf("%d %d", &n, &Q);
      |     ~~~~~^~~~~~~~~~~~~~~~~
zamjene.cpp:154:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  154 |         scanf("%d", &a[i]);
      |         ~~~~~^~~~~~~~~~~~~
zamjene.cpp:176:14: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  176 |         scanf("%d", &op);
      |         ~~~~~^~~~~~~~~~~
zamjene.cpp:180:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  180 |             scanf("%d %d", &p1, &p2);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~
zamjene.cpp:190:18: warning: ignoring return value of 'int scanf(const char*, ...)' declared with attribute 'warn_unused_result' [-Wunused-result]
  190 |             scanf("%d %d", &p1, &p2);
      |             ~~~~~^~~~~~~~~~~~~~~~~~~