/in/foo.cc: In function 'void build(long long int, long long int, long long int, int)':
/in/foo.cc:20:10: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ll mid=l+r>>1;
         ~^~
/in/foo.cc: In function 'void update(long long int, long long int, long long int)':
/in/foo.cc:32:16: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  ll mid=t[ro].l+t[ro].r>>1;
         ~~~~~~~^~~~~~~~