Submission #445025

#	Time	Username	Problem	Language	Result	Execution time	Memory
445025		fuad27	Fancy Fence (CEOI20_fancyfence)	C++14	27 / 100	95 ms	1412 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, sum = 0;
	bool check = false;
	cin >> n;
	ll ans = 0;
	vector<int> h;
	for(int i = 0;i<n;i++) {
		int hi;
		cin >> hi;
		h.push_back(hi);
	}
	for(int i = 0;i<n;i++) {
		int w;cin>>w;
		sum += w;
		sum%=mod;
		if(w != 1)check = 1;
	}
	if(!check and n<=50) {
	for(int i = 0;i<n;i++) {
		int MIN = h[i];
		for(int j = i+1;j<=n;j++) {
			MIN = min(MIN, h[j - 1]);
			ans += bin(MIN);
			ans%=mod;
		}
	}
	cout<<ans;}
	else cout<<rec(sum, h[0])<<endl;
}

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