leetcode 349. Intersection of Two Arrays

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.
<span style="font-size:18px;">class Solution {
public:
    vector<int> intersection(vector<int>& nums1, vector<int>& nums2) {
        vector<int> a;
        sort(nums1.begin(),nums1.end());
        sort(nums2.begin(),nums2.end());
        int i=0,j=0;
        while(i<nums1.size()&&j<nums2.size())
        {
            if(nums1[i]==nums2[j])
            {
                a.push_back(nums1[i]);
                int tmp=nums1[i];
                i++;
                j++;
                while(nums1[i]==tmp)
                    i++;
                while(nums2[j]==tmp)
                    j++;
            }
            if(nums1[i]<nums2[j])
                i++;
            if(nums1[i]>nums2[j])
                j++;
        }
        return a;
    }
};</span>


排序,然后两个vector都只需遍历一遍即可。

比较懒,之前一直比较不愿意学习vector,认为数组能代替就代替了,终于找个机会让自己了解一下。

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转载自blog.csdn.net/vinacky/article/details/51504283