/in/foo.cc: In function 'void build(int, int, int)':
/in/foo.cc:32:19: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  int mid=tree[i].l+tree[i].r>>1;
          ~~~~~~~~~^~~~~~~~~~

VJ4Error('ProblemDataNotFoundError', '题目 5c28fb55f413624d6550c3b1 的数据未找到。', 'ybttg', '5c28fb55f413624d6550c3b1')