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Submission #44366

# Submission time Handle Problem Language Result Execution time Memory
44366 2018-04-01T05:30:45 Z Bruteforceman Tents (JOI18_tents) C++11
100 / 100
 239 ms 36224 KB 
#include <bits/stdc++.h>
using namespace std;
const int mod = 1000000007;
int mem[3003][3003];

long long dp(int H, int W) {
	if(H < 0) return 0;
	if(W < 0) return 0;
	if(H == 0 || W == 0) return 1;
	if(mem[H][W] != -1) return mem[H][W];
	long long ans = 0;
	ans += dp(H - 1, W);
	ans += dp(H - 1, W - 2) * ((W * (W - 1)) / 2); 
	ans += 4LL * dp(H - 1, W - 1) * W;
	ans += dp(H - 2, W - 1) * W * (H - 1);
	ans %= mod;
	return mem[H][W] = ans;
}

int main() {
	memset(mem, -1, sizeof mem);
	int H, W;
	cin >> H >> W;
	long long ans = dp(H, W) - 1;
	if(ans < 0) ans += mod;
	cout << ans << endl;
	return 0;
}

Subtask #1
48.0 / 48.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 35576 KB Output is correct
2 Correct 26 ms 35692 KB Output is correct
3 Correct 26 ms 35748 KB Output is correct
4 Correct 26 ms 35748 KB Output is correct
5 Correct 32 ms 35748 KB Output is correct
6 Correct 26 ms 35868 KB Output is correct
7 Correct 34 ms 36000 KB Output is correct
8 Correct 27 ms 36000 KB Output is correct
9 Correct 27 ms 36000 KB Output is correct
10 Correct 28 ms 36000 KB Output is correct
11 Correct 31 ms 36000 KB Output is correct
12 Correct 29 ms 36000 KB Output is correct

Subtask #2
52.0 / 52.0

# Verdict Execution time Memory Grader output
1 Correct 27 ms 35576 KB Output is correct
2 Correct 26 ms 35692 KB Output is correct
3 Correct 26 ms 35748 KB Output is correct
4 Correct 26 ms 35748 KB Output is correct
5 Correct 32 ms 35748 KB Output is correct
6 Correct 26 ms 35868 KB Output is correct
7 Correct 34 ms 36000 KB Output is correct
8 Correct 27 ms 36000 KB Output is correct
9 Correct 27 ms 36000 KB Output is correct
10 Correct 28 ms 36000 KB Output is correct
11 Correct 31 ms 36000 KB Output is correct
12 Correct 29 ms 36000 KB Output is correct
13 Correct 28 ms 36000 KB Output is correct
14 Correct 27 ms 36068 KB Output is correct
15 Correct 176 ms 36112 KB Output is correct
16 Correct 27 ms 36112 KB Output is correct
17 Correct 42 ms 36112 KB Output is correct
18 Correct 66 ms 36112 KB Output is correct
19 Correct 186 ms 36112 KB Output is correct
20 Correct 151 ms 36224 KB Output is correct
21 Correct 102 ms 36224 KB Output is correct
22 Correct 106 ms 36224 KB Output is correct
23 Correct 75 ms 36224 KB Output is correct
24 Correct 239 ms 36224 KB Output is correct
25 Correct 208 ms 36224 KB Output is correct
26 Correct 210 ms 36224 KB Output is correct
27 Correct 228 ms 36224 KB Output is correct