45. Single Number 在个数都为2的数组中找到个数为1的数

46. Missing Number 在数组中找到从0到n缺失的数字

47. Find the Difference 找两个字符串总t中多出来的那个字符

48. Linked List Cycle 判断一个链表是否有环

49. Min Stack 最小栈 。。。

50. Intersection of Two Linked Lists 找到两个链表的开始相同的节点

51. Minimum Index Sum of Two Lists 两个字符串数组的公共元素，找餐馆问题

52. Word Pattern 字符串与字母的模式匹配 aabb和cat cat dog dog匹配

53. Isomorphic Strings 判断两个字符串的模式是否相同

54.

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