/in/foo.cc: In function 'void pushdown(int, int, int)':
/in/foo.cc:57:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1;
        ~^~
/in/foo.cc: In function 'void build(int&, int, int)':
/in/foo.cc:68:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   int m=l+r>>1;
         ~^~
/in/foo.cc: In function 'void change(int, int, int, int, int, int)':
/in/foo.cc:81:10: 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:91:9: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int m=l+r>>1,re=0;
        ~^~
/in/foo.cc: In function 'int main()':
/in/foo.cc:116:11: warning: unused variable 'j' [-Wunused-variable]
     int i,j,k;
           ^
/in/foo.cc:116:13: warning: unused variable 'k' [-Wunused-variable]
     int i,j,k;
             ^