leetcode 3. Longest Substring Without Repeating Characters
2017-03-22 19:24
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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.
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解法一:更新初始位置,用当前位置减去初始位置。每个字母都要放进map中。
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.
Subscribe to see which companies asked this question.
解法一:更新初始位置,用当前位置减去初始位置。每个字母都要放进map中。
class Solution { public: int lengthOfLongestSubstring(string s) { map<char,int> hashmap; int begin=0; int maxnum=0; for(int i=0,j=0;i<s.size();i++){ if(hashmap.find(s[i])!=hashmap.end()){ j=max(j,hashmap[s[i]]+1); } hashmap[s[i]]=i; maxnum=max(i-j+1,maxnum); } return maxnum; } };
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