func_code_string: #include <bits/stdc++.h>   using namespace std;   const int N = 251, N2 = N * N, M = 1e9 + 7;   long long kc[N2], k1c[N2], ans, n, k, n2, C[N][N];   int main() {     cin >> n >> k;     kc[0] = k1c[0] = 1;     for (int i = 1; i < N2; i++) {       kc[i] = kc[i - 1] * k % M;       k1c[i] = k1c[i - 1] * (k - 1) % M;     }     C[0][0] = 1;     for (int i = 1; i < N; i++) {       C[i][0] = C[i][i] = 1;       for (int j = 1; j < i; j++) {         C[i][j] = (C[i - 1][j] + C[i - 1][j - 1]) % M;       }     }     n2 = n * n;     for (int i = 0; i <= n; i++) {       for (int j = 0; j <= n; j++) {         long long t = C[n][j] * C[n][i] % M * kc[n2 - n * (i + j) + i * j] % M *                       k1c[n * (i + j) - i * j] % M;         if ((i + j) & 1)           ans = (ans + M - t) % M;         else           ans = (ans + t) % M;       }     }     cout << ans << endl;     return 0;   }   