/in/foo.cc: In function 'void build(int&, int, int)':
/in/foo.cc:28:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1;
         ~^~
/in/foo.cc: In function 'void add(int, int, int, int, int, int)':
/in/foo.cc:38:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1;
         ~^~
/in/foo.cc: In function 'int query(int, int, int, int, int)':
/in/foo.cc:48:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1,re=0;
         ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:56:8: warning: unused variable 'j' [-Wunused-variable]
  int i,j,k;
        ^
/in/foo.cc:56:10: warning: unused variable 'k' [-Wunused-variable]
  int i,j,k;
          ^