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package array; import java.util.ArrayList; import java.util.Arrays; import java.util.HashSet; import java.util.Set; /** * @ProjectName: leetcode * @Package: array * @ClassName: Array5332 * @Author: markey * @Description: * @Date: 2020/2/9 10:36 * @Version: 1.0 */ public class Array5332 { public static void main(String[] args) { System.out.println(checkIfExist(new int[] {7,1,14,11})); } public static boolean checkIfExist(int[] arr) { for (int i = 0; i < arr.length; i++) { System.out.println(arr[i]); } Set set = new HashSet<>(); for (int i = 0; i < arr.length; i++) { if (set.contains(arr[i] * 2)) { return true; } if (set.contains(arr[i] / 2) && arr[i] % 2 == 0) { return true; } set.add(arr[i]); } return false; } }