Submission #745870

#	Time	Username	Problem	Language	Result	Execution time	Memory
745870		vjudge1	Fancy Fence (CEOI20_fancyfence)	C++17	0 / 100	2 ms	232 KiB

fancyfence

// Source: https://usaco.guide/general/io

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

const long long MOD=1e9+7;

int main() {
	long long n;
	cin>>n;
	vector<long long> h(n);
	long long wossz=0, ans=0;
	for(long long i=0; i<n; i++){
		cin>>h[i];
	}
	vector<long long> ket;
	for(long long i=0; i<n; i++){
		long long a;
		cin>>a;
		wossz+=a;
		ans=a*(a+1)%MOD;
	}
	ans+=(wossz*(wossz+1)/2)%MOD;
	cout<<ans<<"\n";
}

• 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