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Submission #851283

# Submission time Handle Problem Language Result Execution time Memory
851283 2023-09-19T10:13:09 Z Jawad_Akbar_JJ Fancy Fence (CEOI20_fancyfence) C++14
0 / 100
 10 ms 8024 KB 
#include <bits/stdc++.h>

using namespace std;
#define int long long
const int N = 1e5 + 10;
int r[N][3];
int w[N];
int h[N];
int mod = 1e9 + 7;

int power(int a,int b){
	if (b==0)
		return 1;
	int ans = power(a,b/2);
	ans = ans*ans;
	ans %= mod;
	if (b%2)
		ans = ans*a;
	return ans%mod;
}

int mod_inv(int k){
	return power(k,mod-2);
}

int asd(int a){
	int ans = (a*(a+1));
	ans = ans%mod;
	ans = ans*mod_inv(2);
	ans = ans% mod;
	return ans;
}

signed main(){
	int n;
	cin>>n;
	for (int i=1;i<=n;i++)
		cin>>h[i];
	int ans = 0;
	for (int i=1;i<=n;i++){
		cin>>w[i];
		int a = (w[i]*(w[i]+1));
		a = a % mod;
		a = mod_inv(2) * a;
		ans += a;
		ans %= mod;
		if (h[i]==2)
			ans += 2*a;
		ans %= mod;
	}
	for (int i=n;i>=1;i--){
		for (int j=1;j<=h[i];j++){
			r[i][j] = r[i+1][j];
			ans += (r[i][j]*j)%mod;
			ans %= mod;
			r[i][j] = r[i+1][j] + w[i];
			r[i][j] %= mod;
			// cout<<"At "<<i<<" "<<j<<" added "<<r[i][j]*j<<endl;
		}
	}
	cout<<ans<<endl;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Runtime error 9 ms 8024 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 1 ms 2392 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Incorrect 2 ms 2648 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
0 / 15.0

# Verdict Execution time Memory Grader output
1 Runtime error 9 ms 8024 KB Execution killed with signal 11
2 Halted 0 ms 0 KB -

Subtask #5
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Runtime error 9 ms 8024 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Runtime error 10 ms 8024 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 2392 KB Output is correct
2 Runtime error 9 ms 8024 KB Execution killed with signal 11
3 Halted 0 ms 0 KB -