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// @Title: 加一 (Plus One)
// @Author: 15816537946@163.com
// @Date: 2021-10-21 13:53:44
// @Runtime: 0 ms
// @Memory: 2 MB
func plusOne(digits []int) []int {
	// 每次只能加1位
	var forwordCnt int
	n := len(digits)
	for i := n - 1; i >= 0; i-- {
		if digits[i]+1 < 10 {
			digits[i] += 1
			return digits
		} else {
			digits[i] = 0
			forwordCnt++
		}
	}

	rebuild := make([]int, forwordCnt+1)
	rebuild[0] = 1
	for i := 1; i < forwordCnt; i++ {
		rebuild[i] = 0
	}

	return rebuild
}