Leetcode 28 Find the Index of the First Occurrence in a String Solution in c++ | Hindi Coding Community

 

Given two strings needle and haystack, return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.

Example 1:

Input: haystack = "sadbutsad", needle = "sad"

Output: 0

Explanation: "sad" occurs at index 0 and 6.

The first occurrence is at index 0, so we return 0.

Example 2:

Input: haystack = "leetcode", needle = "leeto"

Output: -1

Explanation: "leeto" did not occur in "leetcode", so we return -1.

int strStr(string haystack, string needle)

{

for (int i = 0; i <= (int)(haystack.length() - needle.length()); i++)

{

if (haystack.substr(i, needle.length()) == needle)

return i;

}

return -1;

}