/in/foo.cc: In function 'int dfs(int, int)':
/in/foo.cc:12:12: warning: suggest parentheses around '&&' within '||' [-Wparentheses]
  if(!a[x].l&&!a[x].r || !a[x].r&&a[x].l&&a[a[x].l].l){
     ~~~~~~~^~~~~~~~~
/in/foo.cc:21:1: warning: control reaches end of non-void function [-Wreturn-type]
 }
 ^

VJ4Error('ProblemDataNotFoundError', '题目 590c9c30d3d8a13210993b4b 的数据未找到。', 'newbzoj', '590c9c30d3d8a13210993b4b')