LeetCode3. Longest Substring Without Repeating Characters
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题目链接
输出最长不重复子串的长度。
一开始觉得是dp,转移方程写了半天没写出来。。看了下tag是双指针,用i和j维护不重复的子串端点。
class Solution {public: int lengthOfLongestSubstring(string s) { int len = s.length(); int a[300]; memset(a, 0, sizeof(a)); int j = 0, ans = 0; for(int i = 0; i < len; i++){ if(!a[s[i]-' ']){ a[s[i]-' '] = 1; }else{ ans = max(ans, (i-j)); while(s[j] != s[i]){ a[s[j]-' '] = 0; j++; } j++; } } ans = max(ans, (len-j)); return ans; }};
坑爹的是居然不都是字母,还有其他符号,所以一开始减’a’就WA了。。
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