foo.cc: In function 'void build(int&, int, int)':
foo.cc:20:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=(l+r>>1);
              ~^~
foo.cc: In function 'void updata(int&, int, int, int, int)':
foo.cc:30:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=(l+r>>1);
              ~^~
foo.cc: In function 'int query(int, int, int, int, int)':
foo.cc:38:15: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=(l+r>>1);
              ~^~
foo.cc: In function 'int main()':
foo.cc:55:35: warning: suggest parentheses around '-' inside '>>' [-Wparentheses]
         int x=read(),y=read(),k=(y-x>>1)+1;
                                  ~^~

[Hydro](https://hydro.ac)提供评测服务