Submission #445004

#	Time	Username	Problem	Language	Result	Execution time	Memory
445004		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;
		x%=mod;
	}
	else {
		x*=((a+1)/2)%mod;
		x*=a%mod;
		x%=mod;
	}
	if(b%2 == 0) {
		x*=(b/2)%mod;
		x*=b+1;
		x%=mod;
	}
	else {
		x*=((b+1)/2)%mod;
		x*=b%mod;
		x%=mod;
	}
	return x%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;
		m%=mod;
	}
	for(ll i = 0;i<n;i++) {
		ll w;
		cin >> w;
		sumW += w%mod;
		sumW%=mod;
	}
	cout<<rec(sumW, m)<<endl;
}

Compilation message (stderr)

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:47:19: warning: 'm' may be used uninitialized in this function [-Wmaybe-uninitialized]
   47 |  cout<<rec(sumW, m)<<endl;
      |                   ^

• 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