645.错误的集合

 

import java.util.HashMap;
import java.util.Map;

/**
 * @program: Test
 * @description: 645 错误的集合
 * @author: gyf
 * @create: 2025-03-23 10:22
 **/
public class Test {
    public static void main(String[] args) {

    }

    public static int[] findErrorNums(int[] nums) {
        int[] arr = new int[2];
        Map<Integer, Integer> map = new HashMap<>(); // 10:2 12:1 13:1
        for (int num : nums) {
            map.put(num, map.getOrDefault(num, 0) + 1);
        }
        for (int i = 1; i <= nums.length; i++) {
            int count = map.getOrDefault(i, 0);
            if (count == 2) {
                arr[0] = i;
            } else if (count == 0) {
                arr[1] = i;
            }
        }
        return arr;
    }
}