oj.uz

Submission #830780

# Submission time Handle Problem Language Result Execution time Memory
830780 2023-08-19T10:29:16 Z vjudge1 Tents (JOI18_tents) C++17
0 / 100
 24 ms 46616 KB 
#include<bits/stdc++.h>
#define ll long long
#define fi first
#define se second
using namespace std;
const ll mod = 1e9 + 7;
ll dp[2][301][301];
ll hiy[3001][3001];
int main() {
    dp[0][0][0] = 1;
    for(int i=0; i<=3000; i++) {
        for(int j=hiy[i][0]=1; j<=i; j++) {
            hiy[i][j] = hiy[i-1][j-1] + hiy[i-1][j];
            hiy[i][j]%=mod;
        }
    }
    int H,W;
    cin >> H >> W;
    for(int i=0; i<H; i++) {
        for(int j=0; j<=W; j++) {
            for(int k=0; k<=W; k++) {
                if(!dp[0][j][k]) continue;
                int xp = W-k-j;
                if(k) {
                    dp[1][j+1][k-1]+=dp[0][j][k] * k % mod;
                    dp[1][j+1][k-1]%=mod;
                }
                if(xp) {
                    dp[1][j+1][k]+=dp[0][j][k] * 3 * xp % mod;
                    dp[1][j+1][k]%=mod;
                    dp[1][j][k+1]+=dp[0][j][k] * xp%mod;
                    dp[1][j][k+1]%=mod;
                }
                if(xp>=2) {
                    dp[1][j+2][k]+=dp[0][j][k] * 1LL * hiy[xp][2] % mod;
                    dp[1][j+2][k]%=mod;
                }
                dp[1][j][k]+=dp[1][j][k]; 
                dp[1][j][k]%=mod;
            }
        }
        for(int j=0; j<=W; j++) {
            for(int k=0; k<=W; k++) {
                dp[0][j][k] = dp[1][j][k];
                dp[1][j][k] = 0;
            }
        }
    }
    ll jwb = 0;
    for(int i=0; i<=W; i++) {
        for(int j=0; j<=W; j++) {
            jwb+=dp[0][i][j];
            jwb%=mod;
        }
    }
    jwb+=(mod-1);
    if(jwb>=mod) jwb-=mod;
    cout << jwb << endl;
    return 0;
}

Subtask #1
0 / 48.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 46616 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 52.0

# Verdict Execution time Memory Grader output
1 Incorrect 24 ms 46616 KB Output isn't correct
2 Halted 0 ms 0 KB -