/in/foo.cc: In function 'void add(int, int, int, int)':
/in/foo.cc:13:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1,ls=k<<1,rs=ls|1;
          ~^~
/in/foo.cc: In function 'int get(int, int, int, int)':
/in/foo.cc:20:11: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=l+r>>1,ls=k<<1,rs=ls|1,ret=0;
          ~^~