349. Intersection of Two Arrays

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.

 

Rust Solution

struct Solution;

use std::collections::HashSet;

impl Solution {
    fn intersection(nums1: Vec<i32>, nums2: Vec<i32>) -> Vec<i32> {
        let h1: HashSet<i32> = nums1.into_iter().collect();
        let h2: HashSet<i32> = nums2.into_iter().collect();
        let bitand = &h1 & &h2;
        bitand.into_iter().collect()
    }
}

#[test]
fn test() {
    let nums1 = vec![1, 2, 2, 1];
    let nums2 = vec![2, 2];
    assert_eq!(Solution::intersection(nums1, nums2), vec![2]);
}

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