package q645

func findErrorNums(nums []int) []int {
	var duplicated, missing int
	seen := make([]bool, len(nums))

	for _, n := range nums {
		if seen[n-1] {
			duplicated = n
		}
		seen[n-1] = true
	}
	for i, ok := range seen {
		if !ok {
			missing = i + 1
			break
		}
	}
	return []int{duplicated, missing}
}

var _ = findErrorNums