Leetcode Implement strStr() problem solution

YASH PAL, 31 July 202418 January 2026

In this Leetcode Implement strStr() problem solution, Implement strStr(). Return the index of the first occurrence of needle in a haystack, or -1 if the needle is not part of the haystack.

Leetcode Implement strStr() problem solution

Leetcode Implement strStr() problem solution in Python.

class Solution:
    def strStr(self, haystack: str, needle: str) -> int:
        try:
            return 0 if len(needle) == 0 else haystack.index(needle, 0, len(haystack))
        except:
            return -1

Implement strStr() problem solution in Java.

class Solution {
    public int strStr(String haystack, String needle) {
        return haystack.indexOf(needle);
 }
}

Problem solution in C++.

class Solution {
public:
    int strStr(string haystack, string needle) 
    {
        if(needle==" ")
            return 0;
        if(haystack.find(needle)!=string::npos)
            return haystack.find(needle);
        return -1;
    }
};

Problem solution in C.

int strStr(char * haystack, char * needle)
{
    int len = strlen(haystack),j;
    int l=strlen(needle);
   
    if(l==0)
    return 0;
    
    if(len<l)
    return -1;
    
    for(int i=0;i<len;i++)
    {
        for(j=0;j<l;j++)
        {
            if(haystack[i+j]!=needle[j])
            break;    
        }
        if(j==l)
        return i;
    }  
    return -1;
}

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