/in/foo.cc: In function 'void tree_build(int, int, int)':
/in/foo.cc:129:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     tree[now].mid=l+r>>1;
                   ~^~
/in/foo.cc: In function 'void st_add(int&, int, int, int, int)':
/in/foo.cc:189:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=l+r>>1;
             ~^~
/in/foo.cc: In function 'int query(int, int, int)':
/in/foo.cc:210:25: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
     int mid=stree[now].l+stree[now].r>>1;
             ~~~~~~~~~~~~^~~~~~~~~~~~~