제출 #444997

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
444997		fuad27	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	204 KiB

fancyfence

#include<bits/stdc++.h>
using namespace std;
#define mod 1000000007

#define int long long
int multiply(int a, int b)
{
   return ((a % mod) * (b % mod))%mod;
}
int32_t main () { 
	int n, m;
	cin >> n;
	int sumW = 0;
	for(int i = 0;i<n;i++) {
		int h;
		cin >> h;
		m = h;
		m%=mod;
	}
	for(int i = 0;i<n;i++) {
		int w;
		cin >> w;
		sumW += w%mod;
		sumW%=mod;
	}
	cout<<multiply(multiply(sumW, sumW+1)/2, multiply(m, m+1)/2)%mod;
}

컴파일 시 표준 에러 (stderr) 메시지

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:26:51: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   26 |  cout<<multiply(multiply(sumW, sumW+1)/2, multiply(m, m+1)/2)%mod;
      |                                           ~~~~~~~~^~~~~~~~

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 0 / 15
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• Subtask 6: 0 / 18
• Subtask 7: 0 / 27