이 제출은 이전 버전의 oj.uz에서 채점하였습니다. 현재는 제출 당시와는 다른 서버에서 채점을 하기 때문에, 다시 제출하면 결과가 달라질 수도 있습니다.
#include<bits/stdc++.h>
using namespace std;
const int N = 1e7 + 5;
int n, x, y, a[N];
int main(){
ios_base::sync_with_stdio(0);cin.tie(0);cout.tie(0);
cin >> n;
for(int i = 1; i <= n; i++){
cin >> x >> y;
a[x] = max(a[x], y);
}
long long ans = 0;
int mx = 0;
for(int i = 1e7; i >= 1; i--){
mx = max(mx, a[i]);
ans += mx;
}
cout << ans;
}
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