LeetCode-- Longest Substring Without Repeating Characters
来源：互联网 发布：王晨芳 网络黄金 编辑：程序博客网 时间：2024/06/06 08:38
Given a string, find the length of the longest substring without repeating characters.
Examples:
Given “abcabcbb”, the answer is “abc”, which the length is 3.
Given “bbbbb”, the answer is “b”, with the length of 1.
Given “pwwkew”, the answer is “wke”, with the length of 3. Note that the answer must be a substring, “pwke” is a subsequence and not a substring.
思路：用字典数组存放下标，更新start变量。
class Solution {public: int lengthOfLongestSubstring(string s) { vector<int>dict(256,-1); int maxLen=0,start=-1; for(int i=0;i<s.size();i++) { if(dict[s[i]]>start) start=dict[s[i]]; dict[s[i]]=i; maxLen=max(maxLen,i-start); } return maxLen; }};阅读全文
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