Submission #997219

#	Time	Username	Problem	Language	Result	Execution time	Memory
997219		goduadzesaba	Tents (JOI18_tents)	C++17	100 / 100	40 ms	71024 KiB

tents

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int N=3e3+5,mod=1e9+7;
int n,m,dp[N][N];
signed main() {
	ios_base::sync_with_stdio(0);
    cin.tie(0); cout.tie(0);
    cin>>n>>m;
    for (int i=0; i<=n; i++) dp[i][0]=1;
    for (int j=0; j<=m; j++) dp[0][j]=1;
    for (int i=1; i<=n; i++)
    	for (int j=1; j<=m; j++){
    		dp[i][j]=dp[i-1][j];
    		if (j>1) dp[i][j]+=dp[i-1][j-2]*j*(j-1)/2;
			dp[i][j]+=dp[i-1][j-1]*4*j;
			if (i>1) dp[i][j]+=dp[i-2][j-1]*j*(i-1);
			dp[i][j]%=mod;
		}
	cout<<dp[n][m]-1;
}

Compilation message (stderr)

tents.cpp: In function 'int main()':
tents.cpp:12:5: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
   12 |     for (int i=1; i<=n; i++)
      |     ^~~
tents.cpp:20:2: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
   20 |  cout<<dp[n][m]-1;
      |  ^~~~

• Subtask 1: 48 / 48
• Subtask 2: 52 / 52