제출 #306953

#제출 시각아이디문제언어결과실행 시간메모리
306953vipghn2003Tents (JOI18_tents)C++14
100 / 100
119 ms70920 KiB
#include<bits/stdc++.h> #define int long long using namespace std; const int N=3005; const int mod=1e9+7; int n,m,dp[N][N]; main() { ios_base::sync_with_stdio(false); cin.tie(nullptr); cin>>n>>m; for(int j=0;j<=m;j++) dp[0][j]=1; for(int j=0;j<=n;j++) dp[j][0]=1; for(int i=1;i<=n;i++) { for(int j=1;j<=m;j++) { dp[i][j]=(dp[i-1][j]+dp[i-1][j-1]*j*4)%mod; if(j>=2) dp[i][j]=(dp[i][j]+dp[i-1][j-2]*j*(j-1)/2)%mod; if(i>=2) dp[i][j]=(dp[i][j]+dp[i-2][j-1]*j*(i-1))%mod; } } cout<<(dp[n][m]-1+mod)%mod; }

컴파일 시 표준 에러 (stderr) 메시지

tents.cpp:9:6: warning: ISO C++ forbids declaration of 'main' with no type [-Wreturn-type]
    9 | main()
      |      ^
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