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.

Solve on Leetcode

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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The Go gopher was designed by Renee French.