Submission #444997

#	Time	Username	Problem	Language	Result	Execution time	Memory
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;
}

Compilation message (stderr)

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
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27