제출 #445012

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
445012		fuad27	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	204 KiB

fancyfence

#include<bits/stdc++.h>
using namespace std;
#define mod 1000000007
typedef long long ll;
#define int long long
ll rec(ll a, ll b)
{
	ll x = 1;
	if(a%2 == 0) {
		x*=(a/2)%mod;
		x*=(a+1);
	}
	else {
		x*=((a+1)/2)%mod;
		x*=a;
	}
	ll y = 1;
	if(b%2 == 0) {
		y*=(b/2)%mod;
		y*=b+1;
	}
	else {
		y*=((b+1)/2)%mod;
		y*=b;
	}
	return (x%mod * y%mod)%mod;
}
int32_t main () { 
	ll n, m;
	cin >> n;
	ll sumW = 0;
	for(ll i = 0;i<n;i++) {
		ll h;
		cin >> h;
		m = h;
	}
	for(ll i = 0;i<n;i++) {
		ll w;
		cin >> w;
		sumW += w;
	}
	cout<<rec(sumW, m)<<endl;
}

컴파일 시 표준 에러 (stderr) 메시지

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:42:19: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   42 |  cout<<rec(sumW, m)<<endl;
      |                   ^

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