oj.uz

답안 #93762

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
93762 2019-01-11T02:57:01 Z silxikys Tents (JOI18_tents) C++14
100 / 100
 549 ms 71308 KB 
#include <bits/stdc++.h>
using namespace std;
typedef long long ll;

const int maxn = 3005, M = 1e9+7;
ll dp[maxn][maxn];
int madd(int a, int b) {
    a += b;
    while (a > M) a -= M;
    return a;
}

int mult(int a, int b) {
    return (1LL*a*b) % M;
}

ll ch2(int a) {
    return ((1LL*a*(a-1))/2) % M;
}

ll f(int i, int j) {
    if (i < 0 || j < 0) return 0;
    if (i == 0 || j == 0) return 1;
    ll& res = dp[i][j];
    if (res != -1) return res;
    res = 0;
    res = madd(res,mult(ch2(j),f(i-1,j-2)));
    res = madd(res,mult(mult(4,j),f(i-1,j-1)));
    res = madd(res,mult(mult(j,i-1),f(i-2,j-1)));
    res = madd(res,f(i-1,j));
    return res;
}

int main()
{
    ios_base::sync_with_stdio(false); cin.tie(NULL);
    int H, W; cin >> H >> W;
    memset(dp,-1,sizeof dp);
    cout << (f(H,W)+M-1) % M << '\n';

    return 0;
}

Subtask #1
48.0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 71032 KB Output is correct
2 Correct 58 ms 71160 KB Output is correct
3 Correct 57 ms 71032 KB Output is correct
4 Correct 57 ms 71088 KB Output is correct
5 Correct 57 ms 71160 KB Output is correct
6 Correct 58 ms 71024 KB Output is correct
7 Correct 57 ms 71032 KB Output is correct
8 Correct 57 ms 71032 KB Output is correct
9 Correct 56 ms 71032 KB Output is correct
10 Correct 54 ms 70996 KB Output is correct
11 Correct 56 ms 71004 KB Output is correct
12 Correct 61 ms 71032 KB Output is correct

Subtask #2
52.0 / 52.0

# 결과 실행 시간 메모리 Grader output
1 Correct 60 ms 71032 KB Output is correct
2 Correct 58 ms 71160 KB Output is correct
3 Correct 57 ms 71032 KB Output is correct
4 Correct 57 ms 71088 KB Output is correct
5 Correct 57 ms 71160 KB Output is correct
6 Correct 58 ms 71024 KB Output is correct
7 Correct 57 ms 71032 KB Output is correct
8 Correct 57 ms 71032 KB Output is correct
9 Correct 56 ms 71032 KB Output is correct
10 Correct 54 ms 70996 KB Output is correct
11 Correct 56 ms 71004 KB Output is correct
12 Correct 61 ms 71032 KB Output is correct
13 Correct 59 ms 71004 KB Output is correct
14 Correct 60 ms 71160 KB Output is correct
15 Correct 392 ms 71308 KB Output is correct
16 Correct 60 ms 71056 KB Output is correct
17 Correct 81 ms 71032 KB Output is correct
18 Correct 127 ms 71032 KB Output is correct
19 Correct 453 ms 71304 KB Output is correct
20 Correct 301 ms 71160 KB Output is correct
21 Correct 188 ms 71132 KB Output is correct
22 Correct 224 ms 71260 KB Output is correct
23 Correct 174 ms 71288 KB Output is correct
24 Correct 543 ms 71288 KB Output is correct
25 Correct 380 ms 71288 KB Output is correct
26 Correct 436 ms 71288 KB Output is correct
27 Correct 549 ms 71288 KB Output is correct