제출 #303332

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
303332		BeanZ	Fancy Fence (CEOI20_fancyfence)	C++14	15 / 100	26 ms	3960 KiB

fancyfence

// I_Love_LPL
#include <bits/stdc++.h>

using namespace std;

#define ll long long
#define endl '\n'
const int N = 1e5 + 5;
const int mod = 1e9 + 7;
ll h[N], w[N];
int main(){
        ios_base::sync_with_stdio(false);
        cin.tie(0);
        if (fopen("A.inp", "r")){
                freopen("test.inp", "r", stdin);
                freopen("test.out", "w", stdout);
        }
        ll n;
        cin >> n;
        ll sum = 0;
        for (int i = 1; i <= n; i++) cin >> h[i];
        for (int i = 1; i <= n; i++) cin >> w[i], sum = (sum + w[i]) % mod;
        cout << (sum * (sum + 1) / 2) % mod * ((h[1] * (h[1] + 1) / 2) % mod) % mod;
}
/*
*/

컴파일 시 표준 에러 (stderr) 메시지

fancyfence.cpp: In function 'int main()':
fancyfence.cpp:15:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   15 |                 freopen("test.inp", "r", stdin);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
fancyfence.cpp:16:24: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)', declared with attribute warn_unused_result [-Wunused-result]
   16 |                 freopen("test.out", "w", stdout);
      |                 ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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