Contains Duplicate.java

/*
    Given an array of integers, find if the array contains any duplicates. Your function should return true if any 
    value appears at least twice in the array, and it should return false if every element is distinct

    Link: https://leetcode.com/problems/contains-duplicate/

    Example: None

    Solution: None
    
    Source: https://leetcode.com/discuss/85387/3ms-java-solution-beats-98%25-of-the-answers
*/

public class Solution {
    public boolean containsDuplicate(int[] nums) {
        int min = Integer.MAX_VALUE;
        int max = Integer.MIN_VALUE;
        for (int b: nums) {
            if (b < min) {
                min = b;
            }
            if (b > max) {
                max = b;
            }
        }
        boolean a[] = new boolean[max - min + 1];
        for (int b : nums) {
            if (a[b - min]) {
                return true;
            } else {
                a[b - min] = true;
            }
        }
        return false;
    }
}