/in/foo.cc: In function 'int segTr::build(int, int, int*, bool)':
/in/foo.cc:123:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   A[x].ls=build(l,l+r>>1,li,w);
                   ~^~
/in/foo.cc:124:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   A[x].rs=build((l+r>>1)+1,r,li,w);
                  ~^~