/in/foo.cc: In function 'int bs(int, int)':
/in/foo.cc:20:16: warning: left operand of comma operator has no effect [-Wunused-value]
   for(j=0,k=0;j<m,k<n;k++)
               ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:33:10: warning: unused variable 'it' [-Wunused-variable]
  int n,m,it;
          ^~