public/subjects/unmatch.en.md

unmatch

Instructions

Write a function, Unmatch, that returns the element of the slice (arr) that does not have a correspondent pair.

• If all the number have a correspondent pair, it shoud return -1.

Expected function

func Unmatch(arr []int) int {

}

Usage

Here is a possible program to test your function :

package main

import (
	"fmt"
	piscine ".."
)

func main() {
	arr := []int{1, 2, 3, 1, 2, 3, 4}
	unmatch := piscine.Unmatch(arr)
	fmt.Println(unmatch)
}

And its output :

student@ubuntu:~/piscine-go/test$ go build
student@ubuntu:~/piscine-go/test$ ./test
4
student@ubuntu:~/piscine-go/test$