func_code_string: #include <bits/stdc++.h>   using namespace std;   int a[505][505], b[505][505], num[250005], c[505];   int read() {     int A;     bool K;     char C;     C = A = K = 0;     while (C <  0  || C >  9 ) K |= C ==  - , C = getchar();     while (C >  /  && C <  : ) A = (A << 3) + (A << 1) + (C ^ 48), C = getchar();     return (K ? -A : A);   }   void write(int X) {     if (X < 0) putchar( - ), X = -X;     if (X > 9) write(X / 10);     putchar(X % 10 | 48);   }   int main() {     int t, i, j, n, m;     t = read();     while (t--) {       n = read(), m = read();       for (i = 1; i <= (n); i++)         for (j = 1; j <= (m); j++) a[i][j] = read();       for (j = 1; j <= (m); j++)         for (i = 1; i <= (n); i++) b[j][i] = read(), num[b[j][i]] = j;       for (j = 1; j <= (m); j++) c[j] = num[a[1][j]];       for (i = 1; i <= (n); i++) {         for (j = 1; j <= (m); j++) write(b[c[j]][i]), putchar(   );         putchar(  n );       }     }     return 0;   }   