func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:200000000 )   using namespace std;   char a[105][105];   int n, m;   bool u[105][105];   int main() {     memset(u, false, sizeof(u));     scanf( %d %d n , &n, &m);     for (int i = 0; i < n; i++, scanf(  n ))       for (int j = 0; j < m; j++) scanf( %c , &a[i][j]);     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         for (int ix = 0; ix < m; ix++)           if (ix != j && a[i][ix] == a[i][j]) u[i][ix] = u[i][j] = true;         for (int ix = 0; ix < n; ix++)           if (ix != i && a[ix][j] == a[i][j]) u[ix][j] = u[i][j] = true;       }     for (int i = 0; i < n; i++)       for (int j = 0; j < m; j++) {         if (!u[i][j]) putchar(a[i][j]);       }     return 0;   }   