Submission #288148

#	TimeUTC-0	Username	Problem	Language	Result	Execution time	Memory
288148	2020-09-01 09:11:30	ngotienhung	Tents (JOI18_tents)	C++14	100 / 100	216 ms	70904 KiB

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#include <bits/stdc++.h>
#define int long long
#define fi first
#define se second
using namespace std;
const int maxN = 3005;
const int mod = 1e9 + 7;
int n,m;
int f[maxN][maxN];
int32_t main()
{
  ios_base::sync_with_stdio(false); cin.tie(); cout.tie();
    cin >> m >> n;
    for(int i = 0; i <= m; ++i)
        f[i][0] = 1;
    for(int i = 0; i <= n; ++i)
        f[0][i] = 1;
    for(int i = 1; i <= m; ++i){
        for(int j = 1; j <= n; ++j){
            f[i][j] = (f[i][j] + f[i - 1][j]) % mod;
            f[i][j] = (f[i][j] + f[i - 1][j - 1] * 4 % mod * j % mod) % mod;
            if(j >= 2)
            f[i][j] = (f[i][j] + f[i - 1][j - 2] * (j*(j - 1)/2 % mod)) % mod;
 
 
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• Subtask 1: 48 / 48
• Subtask 2: 52 / 52