HTMLify

func count(target int, arr []int) int {
    var count int
    for _, n := range arr {
        if n == target {
            count++
        }
    }
    return count
}
func findErrorNums(nums []int) []int {
    ans := []int{0, 0}
    for n:=1; n<=len(nums); n++ {
        c := count(n, nums)
        if c == 0 {
            ans[1] = n
        }
        if c == 2 {
            ans[0] = n
        }
    }
    return ans
}