oj.uz

답안 #798081

# 제출 시각 아이디 문제 언어 결과 실행 시간 메모리
798081 2023-07-30T10:59:02 Z bonk Tents (JOI18_tents) C++14
100 / 100
 256 ms 71156 KB 
#include <bits/stdc++.h>

using namespace std;
using ll = long long;

const int N = 3002;
const ll mod = 1e9 + 7;

ll dp[N][N];

ll multi(ll a, ll b){
    return ((a % mod) * (b % mod)) % mod;
}

ll add(ll a, ll b){
    return (a + b) % mod;
}

ll f(ll x, ll y){
    if(x < 0 || y < 0) return 0;
    if(x == 0 || y == 0) return 1;

    auto &cur = dp[x][y];
    if(cur != -1) return cur;

    cur = add(
            add(
                add(
                    f(x - 1, y),
                    multi(4LL*y, f(x - 1, y - 1))
                ), 
                multi((y*(y - 1LL))/2LL, f(x - 1, y - 2))
            ), 
            multi(y*(x - 1LL), f(x - 2, y - 1))
        );

    return cur;
}

int main(){
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    memset(dp, -1, sizeof(dp));
    int h, w; cin >> h >> w;

    cout << (f(h, w) - 1LL + mod) % mod << '\n';

    return 0;
}

Subtask #1
48.0 / 48.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 70740 KB Output is correct
2 Correct 25 ms 70804 KB Output is correct
3 Correct 23 ms 70760 KB Output is correct
4 Correct 23 ms 70840 KB Output is correct
5 Correct 24 ms 70744 KB Output is correct
6 Correct 25 ms 70804 KB Output is correct
7 Correct 24 ms 70860 KB Output is correct
8 Correct 26 ms 70868 KB Output is correct
9 Correct 29 ms 70820 KB Output is correct
10 Correct 37 ms 70852 KB Output is correct
11 Correct 30 ms 70728 KB Output is correct
12 Correct 25 ms 70856 KB Output is correct

Subtask #2
52.0 / 52.0

# 결과 실행 시간 메모리 Grader output
1 Correct 24 ms 70740 KB Output is correct
2 Correct 25 ms 70804 KB Output is correct
3 Correct 23 ms 70760 KB Output is correct
4 Correct 23 ms 70840 KB Output is correct
5 Correct 24 ms 70744 KB Output is correct
6 Correct 25 ms 70804 KB Output is correct
7 Correct 24 ms 70860 KB Output is correct
8 Correct 26 ms 70868 KB Output is correct
9 Correct 29 ms 70820 KB Output is correct
10 Correct 37 ms 70852 KB Output is correct
11 Correct 30 ms 70728 KB Output is correct
12 Correct 25 ms 70856 KB Output is correct
13 Correct 28 ms 70824 KB Output is correct
14 Correct 24 ms 70996 KB Output is correct
15 Correct 176 ms 71032 KB Output is correct
16 Correct 27 ms 70876 KB Output is correct
17 Correct 53 ms 70828 KB Output is correct
18 Correct 62 ms 70920 KB Output is correct
19 Correct 214 ms 71044 KB Output is correct
20 Correct 164 ms 70952 KB Output is correct
21 Correct 100 ms 70960 KB Output is correct
22 Correct 117 ms 71012 KB Output is correct
23 Correct 120 ms 71156 KB Output is correct
24 Correct 256 ms 71020 KB Output is correct
25 Correct 190 ms 71044 KB Output is correct
26 Correct 223 ms 71124 KB Output is correct
27 Correct 230 ms 71048 KB Output is correct