answer.code: In function ‘int main()’:
answer.code:83:24: error: ‘k’ was not declared in this scope
   83 |     for(int i = 0; i < k; i++){
      |                        ^
answer.code:87:36: error: expected ‘;’ before ‘if’
   87 |             row[j] = B[iMods[i]][j]
      |                                    ^
      |                                    ;
   88 |             if(jModBm[j]){
      |             ~~