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349. Intersection of Two Arrays
题目
Given two arrays, write a function to compute their intersection.
Example 1:
Input: nums1 = [1,2,2,1], nums2 = [2,2]
Output: [2]
Example 2:
Input: nums1 = [4,9,5], nums2 = [9,4,9,8,4]
Output: [9,4]
Note:
- Each element in the result must be unique.
- The result can be in any order.
题目大意
找到两个数组的交集元素,如果交集元素同一个数字出现了多次,只输出一次。
解题思路
把数组一的每个数字都存进字典中,然后在数组二中依次判断字典中是否存在,如果存在,在字典中删除它(因为输出要求只输出一次)。
代码
package leetcode
func intersection(nums1 []int, nums2 []int) []int {
m := map[int]bool{}
var res []int
for _, n := range nums1 {
m[n] = true
}
for _, n := range nums2 {
if m[n] {
delete(m, n)
res = append(res, n)
}
}
return res
}