func_code_string: #include <bits/stdc++.h>   using namespace std;   const int maxn = 250000 + 5;   long long dp[maxn];   int main() {     long long n, m;     scanf( %lld %lld , &n, &m);     dp[0] = dp[1] = 1;     for (long long i = 2; i <= n; i++) {       dp[i] = ((dp[i - 1] % m) * (i % m)) % m;     }     long long sum = 0;     for (long long i = 1; i <= n; i++) {       sum += (((dp[i] % m) * (dp[n - i + 1] % m) % m) * ((n - i + 1) % m)) % m;     }     printf( %lld n , sum % m);   }   