题目意思:求字符串中,最长不重复连续子串 思路:使用hashmap,发现unordered_map会比map快,设置一个起始位置,计算长度时,去减起始位置的值 eg:a,b,c,d,e,c,b,a,e 0 1 2 3 4 4 0 6 5 3 4 4 3 8 再次出现c时,将start值置为map[c]+1=3,对于下一个b,因为map[b]<start,则直接map[b]=i class Solution { public: int lengthOfLongestSubstring(string…

Examples: Description: Given a string, find the length of the longest substring without repeating characters. Example: Given "abcabcbb", the answer is "abc", which the length is 3. Given "bbbbb", the answer is "b",…

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 subst…

Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2: Input: "bbbbb" Output: 1 Explana…

Given a string, find the length of the longest substring without repeating characters. Example 1:           Input: "abcabcbb"                              Output: 3                           Explanation: The answer is "abc", with the l…

题意:给一字符串,求一个子串的长度,该子串满足所有字符都不重复.字符可能包含标点之类的,不仅仅是字母.按ASCII码算,就有2^8=128个. 思路:从左到右扫每个字符,判断该字符距离上一次出现的距离是多少,若大于max,则更新max.若小于,则不更新.每扫到一个字符就需要更新他的出现位置了.这里边还有个注意点,举例说明: 假如有长为16串 s="arbtbqwecpoiuyca" 当扫到第2个b时,距离上一个b的距离是2:(直接减) 当扫到第2个c时,距离上一个c的距离是6:(直接减…

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 subst…

最长无重复字符的子串 Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2: Input: "bbbbb" Output…

Given a string, find the length of the longest substring without repeating characters. Example 1: Input: "abcabcbb" Output: 3 Explanation: The answer is "abc", with the length of 3. Example 2: Input: "bbbbb" Output: 1 Explana…

题目: 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…