/in/foo.cc: In function 'void change(int, int, int, int, int, int)':
/in/foo.cc:59:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1;
         ~^~
/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:71:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1;
         ~^~
/in/foo.cc: In function 'll query(int, int, int, int, int)':
/in/foo.cc:80:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;ll re=0;
        ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:88:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k;
           ^
/in/foo.cc:88:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^