Pick One
Given two arrays, write a function to compute their intersection.
Example:
Given nums1 = [1, 2, 2, 1], nums2 = [2, 2], return [2].
Note:
Each element in the result must be unique.
The result can be in any order.
解法:利用unordered_set实现
class Solution {
public:
vector<int> intersection(vector<int>& nums1, vector<int>& nums2)
{
unordered_set<int> m(nums1.begin(),nums1.end());
vector<int> res;
for(int a:nums2)
{
if(m.count(a))
{
res.push_back(a);
m.erase(a);
}
}
return res;
}
};