/in/foo.cc: In function 'int main()':
/in/foo.cc:56:14: warning: left operand of comma operator has no effect [-Wunused-value]
     mcs=(mcs,ncs);
              ^~~
/in/foo.cc:84:28: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
     if(stack[cnt].x[0]=='n'&&stack[cnt].y[0]!='n'||((stack[cnt].x.length()>stack[cnt].y.length())&&(stack[cnt].x[0]!='n'&&stack[cnt].y[0]!='n')))