Submission #445021

#	Time	Username	Problem	Language	Result	Execution time	Memory
445021		fuad27	Fancy Fence (CEOI20_fancyfence)	C++14	15 / 100	92 ms	1424 KiB

fancyfence

#include<bits/stdc++.h>
using namespace std;
typedef long long ll;
#define mod 1000000007
#define int long long
long long bin(long long x){
	x %= mod;
    return ((x*(x+1))/2)%mod;
}
long long rec(long long x, long long y){
    return (bin(x)*bin(y))%mod;
}
int32_t main () {
	int n;
	cin >> n;
	ll ans = 0;
	vector<int> h;
	for(int i = 0;i<n;i++) {
		int hi;
		cin >> hi;
		h.push_back(hi);
	}
	ll sum = 0;
	for(int i = 0;i<n;i++) {
		ll w;
	 	cin >> w;
		sum+=w;
	}
	cout<<rec(sum, h[0]);
}

Compilation message (stderr)

fancyfence.cpp: In function 'int32_t main()':
fancyfence.cpp:16:5: warning: unused variable 'ans' [-Wunused-variable]
   16 |  ll ans = 0;
      |     ^~~

• Subtask 1: 0 / 0
• Subtask 2: 0 / 12
• Subtask 3: 0 / 13
• Subtask 4: 15 / 15
• Subtask 5: 0 / 15
• Subtask 6: 0 / 18
• Subtask 7: 0 / 27