/** * struct TreeNode { * int val; * struct TreeNode *left; * struct TreeNode *right; * TreeNode(int x) : val(x), left(nullptr), right(nullptr) {} * }; */ #include <queue> #include <vector> #include<algorithm> class Solution { public: /** * 代码中的类名、方法名、参数名已经指定,请勿修改,直...