foo.cc: In function ‘int main()’:
foo.cc:21:39: error: ‘j’ was not declared in this scope
   21 |                         for(int k=i;k<j;k++)
      |                                       ^
foo.cc:24:36: error: ‘j’ was not declared in this scope
   24 |                         if(s[i]==s[j])
      |                                    ^
foo.cc:25:73: error: expected ‘}’ before ‘)’ token
   25 |                                 f[i][j]=min({f[i][j],f[i+1][j],f[i][j-1]);
      |                                             ~                           ^
foo.cc:25:73: note: probably missing a comma or an operator before
foo.cc:26:18: error: expected ‘)’ before ‘cout’
   26 |                 }
      |                  ^
      |                  )
   27 | 
   28 |         cout<<f[0][n-1];
      |         ~~~~      
foo.cc:25:44: note: to match this ‘(’
   25 |                                 f[i][j]=min({f[i][j],f[i+1][j],f[i][j-1]);
      |                                            ^
foo.cc:31:2: error: expected ‘}’ at end of input
   31 | }
      |  ^
foo.cc:9:1: note: to match this ‘{’
    9 | {
      | ^