Language: C++

#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
int N,M;


int main(){
	cin.tie(0);
	ios::sync_with_stdio(false);

	cin >> N >> M;

	int A,B;
	vector<pair<int,int>> Q;
	REP(i,N){
		cin >> A >> B;
		Q.push_back(make_pair(A,B));
	}

	sort(Q.begin(),Q.end());

	long long  ans = 0,n = 0;
	int t = 0;
	while(1){
		ans += min(Q[t].second,M - n) * Q[t].first;
		n += min(Q[t].second,M - n);
		t++;
		if(M == n) break;
	}

	cout << ans << endl;

}

Compiler output:
a.cc: In function 'int main()':
a.cc:26:27: error: no matching function for call to 'min(int&, long long int)'
   26 |                 ans += min(Q[t].second,M - n) * Q[t].first;
      |                        ~~~^~~~~~~~~~~~~~~~~~~
In file included from /usr/include/c++/14/algorithm:60,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:51,
                 from a.cc:1:
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:26:27: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   26 |                 ans += min(Q[t].second,M - n) * Q[t].first;
      |                        ~~~^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
In file included from /usr/include/c++/14/algorithm:61:
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:26:27: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   26 |                 ans += min(Q[t].second,M - n) * Q[t].first;
      |                        ~~~^~~~~~~~~~~~~~~~~~~
a.cc:27:25: error: no matching function for call to 'min(int&, long long int)'
   27 |                 n += min(Q[t].second,M - n);
      |                      ~~~^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note: candidate: 'template<class _Tp> constexpr const _Tp& std::min(const _Tp&, const _Tp&)'
  233 |     min(const _Tp& __a, const _Tp& __b)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:233:5: note:   template argument deduction/substitution failed:
a.cc:27:25: note:   deduced conflicting types for parameter 'const _Tp' ('int' and 'long long int')
   27 |                 n += min(Q[t].second,M - n);
      |                      ~~~^~~~~~~~~~~~~~~~~~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note: candidate: 'template<class _Tp, class _Compare> constexpr const _Tp& std::min(const _Tp&, const _Tp&, _Compare)'
  281 |     min(const _Tp& __a, const _Tp& __b, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algobase.h:281:5: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5686:5: note: candidate: 'template<class _Tp> constexpr _Tp std::min(initializer_list<_Tp>)'
 5686 |     min(initializer_list<_Tp> __l)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5686:5: note:   candidate expects 1 argument, 2 provided
/usr/include/c++/14/bits/stl_algo.h:5696:5: note: candidate: 'template<class _Tp, class _Compare> constexpr _Tp std::min(initializer_list<_Tp>, _Compare)'
 5696 |     min(initializer_list<_Tp> __l, _Compare __comp)
      |     ^~~
/usr/include/c++/14/bits/stl_algo.h:5696:5: note:   template argument deduction/substitution failed:
a.cc:27:25: note:   mismatched types 'std::initializer_list<_Tp>' and 'int'
   27 |                 n += min(Q[t].second,M - n);
      |                      ~~~^~~~~~~~~~~~~~~~~~~