# [Solved] Given an integer num, return the number of steps to reduce it to zero. ## Question

Given an integer `num`, return the number of steps to reduce it to zero.

In one step, if the current number is even, you have to divide it by `2`, otherwise, you have to subtract `1` from it.

Example 1:

```Input: num = 14
Output: 6
Explanation:
Step 1) 14 is even; divide by 2 and obtain 7.
Step 2) 7 is odd; subtract 1 and obtain 6.
Step 3) 6 is even; divide by 2 and obtain 3.
Step 4) 3 is odd; subtract 1 and obtain 2.
Step 5) 2 is even; divide by 2 and obtain 1.
Step 6) 1 is odd; subtract 1 and obtain 0.
```

Example 2:

```Input: num = 8
Output: 4
Explanation:
Step 1) 8 is even; divide by 2 and obtain 4.
Step 2) 4 is even; divide by 2 and obtain 2.
Step 3) 2 is even; divide by 2 and obtain 1.
Step 4) 1 is odd; subtract 1 and obtain 0.
```

Example 3:

```Input: num = 123
Output: 12
```

Constraints:

• `0 <= num <= 106`

## Python Solution

```class Solution:
def numberOfSteps (self, num: int) -> int:
s=0
while 1:
if num==1 or num%2==0:
s+=1
else:
s+=2
num = num//2
if num==0:
break
return s```