Go实现寻找重复数

package main

import "fmt"

func main() {
	intarr := []int{1, 3, 4, 2, 2}
	duplicate := findDuplicate(intarr)
	fmt.Println(duplicate)
}
func findDuplicate(nums []int) int {
	numse := make(map[int]int)
	for i := range nums {
		if _, ok := numse[nums[i]]; ok {
			return nums[i]
		}
		numse[nums[i]] = i
	}
	return 0
}