Contains Duplicate

Given an integer array nums, return true if any value appears at least twice in the array, and return false if every element is distinct.

Solution in Go

func containsDuplicate(nums []int) bool {
    set := make(map[int]struct{})
    for _, n := range nums {
        _, contains := set[n]
        if contains {
            return true
        set[n] = struct{}{}
    return false

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