How to implement array intersection operation in Golang

Array intersection operations in Golang can be implemented through hash tables, sorting or sets. Using a hash table, store the first array element in the hash table and then iterate through the second array. If the element exists in the hash table, it belongs to the intersection. Using sort, sort both arrays and then use double pointer traversal to compare the elements and find a match. Using a set, add the first array element to the set, then iterate over the second array, and if the element belongs to the set, it belongs to the intersection.

How to implement the intersection operation of arrays in Golang

The intersection operation obtains elements that appear simultaneously in two sets. This article will introduce how to implement the intersection operation of arrays in Golang, and provide a practical case to demonstrate the specific implementation steps.

Method

There is no built-in intersection operation function in Golang, so we need to implement it ourselves. Here are some common implementation methods:

• Use a hash table: Store the elements of the first array in the hash table, then iterate through the second array, checking Whether each element is in the hash table. If it exists, it belongs to the intersection.
• Use sort: Sort the two arrays, then use double pointers to iterate over both arrays, compare elements and find matches.
• Use a collection: Use a collection data structure (such as map or set) to add the elements of the first array to the collection, Then iterate through the second array and check if each element belongs to the set.

Practical case:

Suppose we have two arrays: arr1 and arr2. We need to find their intersection.

func intersection(arr1, arr2 []int) []int {
    // 使用哈希表方法
    hash := make(map[int]bool)
    for _, v := range arr1 {
        hash[v] = true
    }
    result := []int{}
    for _, v := range arr2 {
        if hash[v] {
            result = append(result, v)
        }
    }
    return result
}

func main() {
    arr1 := []int{1, 2, 3, 4, 5}
    arr2 := []int{3, 4, 5, 6, 7}
    fmt.Println(intersection(arr1, arr2)) // 输出：[3, 4, 5]
}

Conclusion:

This article introduces how to implement the intersection operation of arrays in Golang, and provides practical cases using the hash table method. Depending on the situation, the most appropriate implementation method can be chosen.

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