Submission #212108

#	Time	Username	Problem	Language	Result	Execution time	Memory
212108		Kalam	Zapina (COCI20_zapina)	C++11	110 / 110	169 ms	1656 KiB

zapina

// KALAM
# include<bits/stdc++.h>

using namespace std;

const int N = 300 + 77 , Mod = 1000000007;
int n , A , dp[N][N] , C[N][N];
int main() {
   for(int i = 0;i < N;++ i)
      C[0][i] = C[i][i] = 1;
   for(int i = 1;i < N;++ i)
      for(int j = i + 1;j < N;++ j)
         C[i][j] = (C[i - 1][j - 1] + C[i][j - 1]) % Mod;
   scanf("%d" , & n);
   dp[0][0] = 1;
   for(int i = 1;i <= n;++ i)
      for(int j = 0;j <= n;++ j)
         for(int k = 0;k <= j;++ k)
            if(k != i) {
               dp[i][j] = (dp[i][j] + C[k][n - j + k] * 1ll * dp[i - 1][j - k]) % Mod;
            }
   A = 1;
   for(int i = 1;i <= n;++ i)
      A = A * 1ll * n % Mod;
   A = (A + Mod - dp[n][n]) % Mod;
   printf("%d\n" , A);
   return 0;
}

Compilation message (stderr)

zapina.cpp: In function 'int main()':
zapina.cpp:14:9: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
    scanf("%d" , & n);
    ~~~~~^~~~~~~~~~~~

• Subtask 1: 22 / 22
• Subtask 2: 33 / 33
• Subtask 3: 55 / 55