Submission #237254

#	Submission time	Handle	Problem	Language	Result	Execution time	Memory
237254	2020-06-05T13:12:44 Z	Charis02	Tents (JOI18_tents)	C++14	100 / 100	337 ms	71288 KB

tents

#include<iostream>
#include<stdio.h>
#include<vector>
#include<cmath>
#include<queue>
#include<string.h>
#include<map>
#include<set>
#include<algorithm>
#define ll long long
#define pi pair < ll,ll >
#define mp(a,b) make_pair(a,b)
#define mid (low+high)/2
#define rep(i,a,b) for(int i = a;i < b;i++)
#define N 3004
#define INF 1e9+7

using namespace std;

ll n,m,mod=1e9+7;
ll dp[N][N];

ll solve(ll i,ll j)
{
    if(i < 0 || j < 0)
        return 0;
    if(i==0||j==0)
        return 1;
    if(dp[i][j]!=-1)
        return dp[i][j];

    return dp[i][j] = ((solve(i-1,j-2)*(j*(j-1))/2)%mod + (solve(i-2,j-1)*(i-1)*j)%mod + (4*j*solve(i-1,j-1))%mod + (solve(i-1,j)))%mod;
}

int main()
{
    ios_base::sync_with_stdio(false);
    cin.tie(0);
    memset(dp,-1,sizeof dp);

    cin >> n >> m;
    cout << (solve(n,m)-1+mod)%mod << endl;

    return 0;
}

Subtask #1

48.0 / 48.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	38 ms	71036 KB	Output is correct
2	Correct	40 ms	70908 KB	Output is correct
3	Correct	37 ms	71032 KB	Output is correct
4	Correct	38 ms	71032 KB	Output is correct
5	Correct	37 ms	71032 KB	Output is correct
6	Correct	38 ms	71032 KB	Output is correct
7	Correct	38 ms	71032 KB	Output is correct
8	Correct	37 ms	71032 KB	Output is correct
9	Correct	39 ms	70920 KB	Output is correct
10	Correct	39 ms	71040 KB	Output is correct
11	Correct	38 ms	71040 KB	Output is correct
12	Correct	41 ms	71036 KB	Output is correct

Subtask #2

52.0 / 52.0

#	Verdict	Execution time	Memory	Grader output
1	Correct	38 ms	71036 KB	Output is correct
2	Correct	40 ms	70908 KB	Output is correct
3	Correct	37 ms	71032 KB	Output is correct
4	Correct	38 ms	71032 KB	Output is correct
5	Correct	37 ms	71032 KB	Output is correct
6	Correct	38 ms	71032 KB	Output is correct
7	Correct	38 ms	71032 KB	Output is correct
8	Correct	37 ms	71032 KB	Output is correct
9	Correct	39 ms	70920 KB	Output is correct
10	Correct	39 ms	71040 KB	Output is correct
11	Correct	38 ms	71040 KB	Output is correct
12	Correct	41 ms	71036 KB	Output is correct
13	Correct	40 ms	71032 KB	Output is correct
14	Correct	38 ms	71160 KB	Output is correct
15	Correct	243 ms	71160 KB	Output is correct
16	Correct	40 ms	71040 KB	Output is correct
17	Correct	53 ms	71036 KB	Output is correct
18	Correct	79 ms	71032 KB	Output is correct
19	Correct	282 ms	71240 KB	Output is correct
20	Correct	202 ms	71160 KB	Output is correct
21	Correct	118 ms	71032 KB	Output is correct
22	Correct	165 ms	71160 KB	Output is correct
23	Correct	119 ms	71288 KB	Output is correct
24	Correct	333 ms	71160 KB	Output is correct
25	Correct	256 ms	71288 KB	Output is correct
26	Correct	304 ms	71160 KB	Output is correct
27	Correct	337 ms	71288 KB	Output is correct