/in/foo.cc: In function 'void zwh()':
/in/foo.cc:23:8: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   mid=x+y>>1;
       ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:37:35: error: expected '}' at end of input
     if(a[mid]!=s) cout<<"-1"<<endl;
                                   ^