3. Longest Substring Without Repeating Characters LeetCode
2016-03-17 22:48
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题意：给出一个字符串，求最长的不含相同字母的连续子串。
题解：hash+两个指针，hash每个字母最近出现的位置。left指针指向不包含当前字母的最远处。答案是i - left + 1，不停的更新。
题解：hash+两个指针，hash每个字母最近出现的位置。left指针指向不包含当前字母的最远处。答案是i - left + 1，不停的更新。
class Solution {
public:
int lengthOfLongestSubstring(string s) {
int n = s.length();
if(n == 0) return 0;
unordered_map<char,int> hash;
hash.clear();
int left = 0,maxlen = 0;
for(int i = 0; i < n; i++)
{
if(hash.find(s[i]) != hash.end())
{
if(left <= hash[s[i]])
left = hash[s[i]] + 1;
}
hash[s[i]] = i;
maxlen = max(maxlen,i - left + 1);
}
return maxlen;
}
};
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