Leetcode#3 Longest Substring Without Repeating Characters
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Difficulty:Medium
Given a string, find the length of the longest substring without repeating characters. For example, the longest substring without repeating letters for "abcabcbb" is "abc", which the length is 3. For "bbbbb" the longest substring is "b", with the length of 1.
还需巩固总结更多哈希表的题目
int lengthOfLongestSubstring(string s) { int a[256]; memset(a, -1, sizeof(a)); int ans=0, start=0, end1=0; for(int i =0; i<s.length();i++){ if(a[s[i]]==-1){ end1++; ans = ans>(end1-start)?ans : (end1-start); a[s[i]]=i; } else{ if(a[s[i]]>=start) start=a[s[i]]+1; end1++; ans = ans>(end1-start)?ans : (end1-start); a[s[i]]=i; } } return ans; } 0 0
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