397. Integer Replacement
Description
Given a positive integer n
, you can apply one of the following operations:
- If
n
is even, replacen
withn / 2
. - If
n
is odd, replacen
with eithern + 1
orn - 1
.
Return the minimum number of operations needed for n
to become 1
.
Example 1:
Input: n = 8 Output: 3 Explanation: 8 -> 4 -> 2 -> 1
Example 2:
Input: n = 7 Output: 4 Explanation: 7 -> 8 -> 4 -> 2 -> 1 or 7 -> 6 -> 3 -> 2 -> 1
Example 3:
Input: n = 4 Output: 2
Constraints:
1 <= n <= 231 - 1
Solutions
Solution 1
1 2 3 4 5 6 7 8 9 10 11 12 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 |
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 |
|