/*
 * @lc app=leetcode id=28 lang=java
 *
 * [28] Find the Index of the First Occurrence in a String
 */

// @lc code=start
class Solution {
    public int strStr(String haystack, String needle) {
        int idx = -1;
        if(haystack.length() < needle.length()) {
            return idx;
        }
        for(int i = 0; i < haystack.length(); i++) {
            if(i + needle.length() <= haystack.length() && haystack.substring(i, i + needle.length()).equals(needle))  {
                idx = i;
                break;
            }
        }
        return idx;
    }
}
// @lc code=end