Submission #1027636

#	Time	Username	Problem	Language	Result	Execution time	Memory
1027636		FIFI_cpp	Unija (COCI17_unija)	C++17	100 / 100	241 ms	49344 KiB

unija

#include <bits/stdc++.h>
using namespace std;
 
#define ll long long
#define ar array
#define int long long
 
const int N = 5e5 + 20;
const int INF = 1e17;
const int MOD = 8;
const int X = 4000;
const int LOG = 21;
 
#pragma GCC optimize("O3,Ofast,unroll-loops")
#pragma GCC target("avx,avx2")
 
bitset<N> del;
 
bool cmp(ar<int, 2> a, ar<int, 2> b){
	if(a[0] == b[0])return a[1] > b[1];
	return a[0] < b[0];
}
 
signed main(){ios_base::sync_with_stdio(false);cin.tie(0);
	int n;
	cin>>n;
	ar<int, 2> A[n];
	for(int i = 0;i  < n;i++){
		cin>>A[i][0]>>A[i][1];
	}
	sort(A, A + n, cmp);
	
	vector<ar<int, 2> > v;
	v.push_back(A[0]);
	for(int i = 1;i < n;i++){
		while(v.back()[1] < A[i][1])v.pop_back();
		v.push_back(A[i]);
	}
	
	int ans = v[0][0] * v[0][1];
	for(int i = 1;i < v.size();i++)ans += v[i][0] * v[i][1] - v[i-1][0] * v[i][1];
	cout<<ans;
}

Compilation message (stderr)

unija.cpp: In function 'int main()':
unija.cpp:41:18: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<std::array<long long int, 2> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   41 |  for(int i = 1;i < v.size();i++)ans += v[i][0] * v[i][1] - v[i-1][0] * v[i][1];
      |                ~~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 10 / 10
• Subtask 3: 10 / 10
• Subtask 4: 10 / 10
• Subtask 5: 10 / 10
• Subtask 6: 10 / 10
• Subtask 7: 10 / 10
• Subtask 8: 10 / 10
• Subtask 9: 10 / 10
• Subtask 10: 10 / 10