Submission #1796439


Source Code Expand

#include <bits/stdc++.h>
using namespace std;

const int N = 5005;
const int md = 1e9 + 7;
const int inv2 = 5e8 + 4;

int n, m;
string s;
int f[N][N];

int main() {
	ios_base::sync_with_stdio(false); cin.tie(0);
	cin >> n >> s;
	m = s.size();

	f[0][0] = 1;
	for (int i = 1; i <= n; ++i) {
		f[i][0] = (f[i-1][0] + f[i-1][1]) % md; 
		for (int j = 1; j <= n; ++j) {
			f[i][j] = (f[i-1][j+1] + f[i-1][j-1] * 2LL % md) % md;
		}
	}

	int inv = 1;
	for (int i = 1; i <= m; ++i) inv = 1LL * inv * inv2 % md;
	cout << 1LL * f[n][m] * inv % md << endl;
}

Submission Info

Submission Time
Task F - Unhappy Hacking
User cheater2k
Language C++14 (GCC 5.4.1)
Score 800
Code Size 576 Byte
Status AC
Exec Time 99 ms
Memory 98048 KB

Judge Result

Set Name Sample Sub1 Sub2
Score / Max Score 0 / 0 400 / 400 400 / 400
Status
AC × 3
AC × 23
AC × 44
Set Name Test Cases
Sample 0_01, 0_02, 0_03
Sub1 0_01, 0_02, 1_04, 1_05, 1_06, 1_07, 1_08, 1_09, 1_10, 1_11, 1_12, 1_13, 1_14, 1_15, 1_16, 1_17, 1_18, 1_19, 1_20, 1_21, 1_22, 1_23, 1_24
Sub2 0_01, 0_02, 0_03, 1_04, 1_05, 1_06, 1_07, 1_08, 1_09, 1_10, 1_11, 1_12, 1_13, 1_14, 1_15, 1_16, 1_17, 1_18, 1_19, 1_20, 1_21, 1_22, 1_23, 1_24, 2_25, 2_26, 2_27, 2_28, 2_29, 2_30, 2_31, 2_32, 2_33, 2_34, 2_35, 2_36, 2_37, 2_38, 2_39, 2_40, 2_41, 2_42, 2_43, 2_44
Case Name Status Exec Time Memory
0_01 AC 1 ms 256 KB
0_02 AC 2 ms 4864 KB
0_03 AC 99 ms 98048 KB
1_04 AC 1 ms 256 KB
1_05 AC 2 ms 4864 KB
1_06 AC 2 ms 4864 KB
1_07 AC 2 ms 4864 KB
1_08 AC 2 ms 4864 KB
1_09 AC 2 ms 4864 KB
1_10 AC 2 ms 4864 KB
1_11 AC 2 ms 4864 KB
1_12 AC 2 ms 4864 KB
1_13 AC 2 ms 4864 KB
1_14 AC 2 ms 4864 KB
1_15 AC 2 ms 4864 KB
1_16 AC 2 ms 4864 KB
1_17 AC 2 ms 4864 KB
1_18 AC 2 ms 4864 KB
1_19 AC 2 ms 4864 KB
1_20 AC 1 ms 512 KB
1_21 AC 2 ms 2816 KB
1_22 AC 1 ms 512 KB
1_23 AC 2 ms 4864 KB
1_24 AC 2 ms 4864 KB
2_25 AC 99 ms 98048 KB
2_26 AC 99 ms 98048 KB
2_27 AC 99 ms 98048 KB
2_28 AC 99 ms 98048 KB
2_29 AC 99 ms 98048 KB
2_30 AC 99 ms 98048 KB
2_31 AC 99 ms 98048 KB
2_32 AC 99 ms 98048 KB
2_33 AC 99 ms 98048 KB
2_34 AC 99 ms 98048 KB
2_35 AC 99 ms 97920 KB
2_36 AC 99 ms 97920 KB
2_37 AC 99 ms 97920 KB
2_38 AC 99 ms 97920 KB
2_39 AC 99 ms 97920 KB
2_40 AC 81 ms 88320 KB
2_41 AC 45 ms 63360 KB
2_42 AC 94 ms 96512 KB
2_43 AC 56 ms 71808 KB
2_44 AC 5 ms 13184 KB