/in/foo.cc: In function 'int main()':
/in/foo.cc:55:14: warning: left operand of comma operator has no effect [-Wunused-value]
     mcs=(mcs,ncs);
              ^~~
/in/foo.cc:76:10: warning: statement has no effect [-Wunused-value]
      flag==-1;continue;
      ~~~~^~~~