/in/foo.cc: In function 'void change(int, int, int)':
/in/foo.cc:49:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'void query(int, int, int)':
/in/foo.cc:58:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~