sun_apple_123

/** * Definition for singly-linked list. * struct ListNode { * int val; * ListNode *next; * ListNode(int x) : val(x), next(NULL) {} * }; */ class Solution { public: ListNode* ad

枚举：O(N^2) class Solution { public: int lengthOfLongestSubstring(string s) { bool unique[130]; int maxl=0; for(int i=0;i<s.length();i++){ int len=0;