LeetCode-Go/leetcode/0448.Find-All-Numbers-Disappeared-in-an-Array/448. Find All Numbers Disappeared in an Array.go

package leetcode

func findDisappearedNumbers(nums []int) []int {
	res := []int{}
	for _, v := range nums {
		if v < 0 {
			v = -v
		}
		if nums[v-1] > 0 {
			nums[v-1] = -nums[v-1]
		}
	}
	for i, v := range nums {
		if v > 0 {
			res = append(res, i+1)
		}
	}
	return res
}