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Submission #746027

# Submission time Handle Problem Language Result Execution time Memory
746027 2023-05-21T10:39:51 Z vjudge1 Fancy Fence (CEOI20_fancyfence) C++17
30 / 100
 146 ms 1844 KB 
#include <bits/stdc++.h>
using namespace std;
#define int long long

const int mod=1000000007;

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

int f(int wossz, int hossz){
	return (((((hossz*(hossz+1)%mod*binpow(2, mod-2))%mod) * wossz)%mod)*(wossz+1)%mod*binpow(2, mod-2)%mod)%mod;
}

int32_t main() {
	// all hi are equal --> téglalap
	int s;
	cin>>s;
	int h[s];
	int w[s];
	int wossz = 0;
	bool teglalap = true;
	for (int i=0; i<s; i++){
		cin >> h[i];
		if (h[i] != h[0]) teglalap = false;
	}
	int hossz = h[0];
	for(int i=0; i<s; i++){
		cin>>w[i];
		wossz = (w[i] + wossz) % mod;
	}
	
	if (teglalap){
		cout << f(wossz, hossz);
		return 0;
	}
	
	// --------------- lépcső -----------------
	int ans = f(wossz, h[0]);
	wossz = (wossz - w[0])%mod;
	for (int i=1; i<s; i++){
		ans = (ans + f((wossz+mod)%mod, h[i]))%mod;
		ans =  (ans - f((wossz+mod)%mod, h[i-1]))%mod;
		wossz = (wossz - w[i])%mod; 
	}
	ans=(ans+mod)%mod;
	cout << ans<<"\n";
	return 0;
}

Subtask #1
0.0 / 0.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 2 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #2
0 / 12.0

# Verdict Execution time Memory Grader output
1 Incorrect 0 ms 212 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 13.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Incorrect 1 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #4
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Correct 8 ms 340 KB Output is correct
3 Correct 38 ms 980 KB Output is correct
4 Correct 79 ms 1748 KB Output is correct
5 Correct 73 ms 1836 KB Output is correct
6 Correct 1 ms 240 KB Output is correct

Subtask #5
15.0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 212 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 9 ms 444 KB Output is correct
4 Correct 52 ms 1052 KB Output is correct
5 Correct 79 ms 1836 KB Output is correct
6 Correct 73 ms 1840 KB Output is correct
7 Correct 2 ms 340 KB Output is correct
8 Correct 13 ms 448 KB Output is correct
9 Correct 62 ms 980 KB Output is correct
10 Correct 125 ms 1748 KB Output is correct
11 Correct 146 ms 1844 KB Output is correct
12 Correct 0 ms 212 KB Output is correct

Subtask #6
0 / 18.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 2 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -

Subtask #7
0 / 27.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 212 KB Output is correct
2 Incorrect 2 ms 212 KB Output isn't correct
3 Halted 0 ms 0 KB -