Submission #946072

#	Time	Username	Problem	Language	Result	Execution time	Memory
946072		hmm789	Fancy Fence (CEOI20_fancyfence)	C++14	0 / 100	1 ms	348 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, ans = 0, cur = 0, sm = 0;
	cin >> n;
	int h[n], w[n];
	for(int i = 0; i < n; i++) cin >> h[i];
	for(int i = 0; i < n; i++) cin >> w[i];
	for(int i = 0; i < n; i++) {
		if(h[i] == 2) cur += w[i];
		else {
			ans += cur*(cur-1) % MOD;
			ans %= MOD;
			cur = 0;
		}
		sm += w[i];
	}
	ans += cur*(cur-1) % MOD;
	ans %= MOD;
	ans += sm*(sm-1)/2 % MOD;
	cout << ans%MOD;
}

• 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