제출 #745766

#제출 시각아이디문제언어결과실행 시간메모리
745766vjudge1Fancy Fence (CEOI20_fancyfence)C++17
0 / 100
1 ms212 KiB
#include <bits/stdc++.h>
using namespace std;

int main(){

    int h, w;
    int wsum = 0;
    int n; cin >> n;
    for(int i = 0; i < n; i++){
        cin >> h >> w;
        wsum += w;
        w = w%1000000007;
    }
    wsum *= (wsum+1);
    wsum %= 1000000007;
    wsum *= h;
    wsum %= 1000000007;
    wsum *= (h+1);
    wsum %= 1000000007;
    while(wsum % 4 != 0){
        wsum += 1000000007;
    }
    wsum /= 4;
    cout << wsum;
}
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