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


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



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;
}