Question

How to find an element that appears once in an array of elements that appears three times in Go

Answer 1

package main
 
import "fmt"
 
func findElementThatAppearsOnceInArray(arr []int) int {
    mp := make(map[int]int)
 
    for _, x := range arr {
        mp[x]++
    }
 
    for k, v := range mp {
        if v == 1 {
            return k
        }
    }
 
    return -1
}
 
func main() {
    arr:= []int{3, 5, 5, 2, 7, 3, 2, 8, 8, 3, 2, 5, 8}
 
    fmt.Println(findElementThatAppearsOnceInArray(arr))
}
 
 
 
/*
run:
 
7
 
*/

 

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