349. 两个数组的交集

https://leetcode-cn.com/problems/intersection-of-two-arrays/solution/xi-sheng-kong-jian-huan-qu-shi-jian-by-while1-4/
class Solution {
public:
    vector intersection(vector& nums1, vector& nums2) {
        bool a[9999]={0};
        vector b;
        for (int i=0;i            a[nums1[i]]=1;
        for (int j=0;j        {
            if (a[nums2[j]]==1)
            {
                b.push_back(nums2[j]);
                a[nums2[j]]=0;
            }
        }
        return b;
    }
};