Submission #798080

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
798080	2023-07-30T10:57:47 Z	vjudge1	Tents (JOI18_tents)	C++17	100 / 100	241 ms	71168 KB

tents

#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

#	Verdict	Execution time	Memory	Grader output
1	Correct	23 ms	70868 KB	Output is correct
2	Correct	27 ms	70868 KB	Output is correct
3	Correct	21 ms	70800 KB	Output is correct
4	Correct	22 ms	70868 KB	Output is correct
5	Correct	24 ms	70832 KB	Output is correct
6	Correct	23 ms	70760 KB	Output is correct
7	Correct	22 ms	70740 KB	Output is correct
8	Correct	21 ms	70884 KB	Output is correct
9	Correct	22 ms	70844 KB	Output is correct
10	Correct	23 ms	70836 KB	Output is correct
11	Correct	28 ms	70748 KB	Output is correct
12	Correct	29 ms	70768 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	23 ms	70868 KB	Output is correct
2	Correct	27 ms	70868 KB	Output is correct
3	Correct	21 ms	70800 KB	Output is correct
4	Correct	22 ms	70868 KB	Output is correct
5	Correct	24 ms	70832 KB	Output is correct
6	Correct	23 ms	70760 KB	Output is correct
7	Correct	22 ms	70740 KB	Output is correct
8	Correct	21 ms	70884 KB	Output is correct
9	Correct	22 ms	70844 KB	Output is correct
10	Correct	23 ms	70836 KB	Output is correct
11	Correct	28 ms	70748 KB	Output is correct
12	Correct	29 ms	70768 KB	Output is correct
13	Correct	24 ms	70776 KB	Output is correct
14	Correct	27 ms	71028 KB	Output is correct
15	Correct	200 ms	71064 KB	Output is correct
16	Correct	24 ms	70868 KB	Output is correct
17	Correct	34 ms	70868 KB	Output is correct
18	Correct	56 ms	70872 KB	Output is correct
19	Correct	197 ms	71068 KB	Output is correct
20	Correct	156 ms	71024 KB	Output is correct
21	Correct	99 ms	70968 KB	Output is correct
22	Correct	115 ms	71008 KB	Output is correct
23	Correct	81 ms	71076 KB	Output is correct
24	Correct	241 ms	71168 KB	Output is correct
25	Correct	192 ms	71040 KB	Output is correct
26	Correct	225 ms	70996 KB	Output is correct
27	Correct	227 ms	71036 KB	Output is correct