Submission #946063

#	Time	Username	Problem	Language	Result	Execution time	Memory
946063		hmm789	Fancy Fence (CEOI20_fancyfence)	C++14	30 / 100	29 ms	3572 KiB

fancyfence

#include <bits/stdc++.h>
using namespace std;
#define int long long 
#define INF 1000000000000000000
#define MOD 1000000007

int32_t main() {
	ios_base::sync_with_stdio(0);
	cin.tie(0); cout.tie(0);
	int n;
	cin >> n;
	int h[n], w[n], dp[n];
	for(int i = 0; i < n; i++) cin >> h[i];
	for(int i = 0; i < n; i++) cin >> w[i];
	int pre[n];
	pre[0] = 0;
	for(int i = 0; i < n-1; i++) {
		int num = h[i]*(h[i]+1)/2 % MOD;
		pre[i+1] = pre[i] + w[i]*num % MOD;
		pre[i+1] %= MOD;
	}
	for(int i = 0; i < n; i++) {
		int num = (w[i]+1)*w[i]/2 % MOD, num2 = (h[i]+1)*h[i]/2 % MOD;
		dp[i] = num * num2 % MOD + (i==0?0:dp[i-1]) + (w[i]*pre[i]) % MOD;
		dp[i] %= MOD;
	}
	cout << dp[n-1];
}

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