35. Same Tree 判断两棵树相同

36. Invert Binary Tree 翻转树

37. Symmetric Tree 判断树是不是镜像对称的

38. Maximum Depth of Binary Tree 最大深度

39.  Minimum Depth of Binary Tree 。。。

40. Balanced Binary Tree 平衡二叉树判断

41. Convert BST to Greater Tree bst树的转化

42. Pascal's Triangle 求这个Pascal序列

43. Pascal's Triangle 2 求给定索引的Pascal序列的list

44. Maximum Average Subarray I 求数组的连续n个数的最大值

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