LeetCode 28 实现 strStr()

Posted 2021-12-14 Starzkg

https://leetcode-cn.com/problems/implement-strstr/

解决方案

class Solution 
    public int strStr(String haystack, String needle) 
        if (needle.length() == 0) 
            return 0;
        
        for (int i = 0; i + needle.length() <= haystack.length(); i++) 
            boolean flag = true;
            for (int j = 0; j < needle.length(); j++) 
                if (haystack.charAt(i + j) != needle.charAt(j)) 
                    flag = false;
                    break;
                
            
            if (flag) 
                return i;
            
        
        return -1;