349. 两个数组的交集.md

Meta

• alias:
• parent :: [[algo-哈希]]
• siblings ::
• child :: [[Integer list or set convert to int array]]
• refs: https://leetcode.cn/problems/intersection-of-two-arrays/

---

class Solution {
    public int[] intersection(int[] nums1, int[] nums2) {
        Set<Integer> set = new HashSet<>();
        for (int num : nums1) {
            set.add(num);
        }
        Set<Integer> result = new HashSet<>();
        for (int num : nums2) {
            if (set.contains(num)) {
                result.add(num);
            }
        }
        // Integer List or Set to int array
        return result.stream().mapToInt(Integer::intValue).toArray();
    }
}