## Leetcode - Angle Between Hands of a Clock

https://leetcode.com/problems/angle-between-hands-of-a-clock/

Given two numbers, `hour` and `minutes`. Return the smaller angle (in degrees) formed between the `hour` and the `minute` hand.

Example 1:

```Input: hour = 12, minutes = 30
Output: 165
```

## Leetcode - Power of Four

https://leetcode.com/problems/power-of-four/

Given an integer (signed 32 bits), write a function to check whether it is a power of 4.

Example 1:

```Input: 16
Output: true
```

## Leetcode - Power of Three

https://leetcode.com/problems/power-of-three/

Given an integer, write a function to determine if it is a power of three.

Example 1:

```Input: 27
Output: true
```

Example 2:

```Input: 0
Output: false```

## Leetcode - Power of Two

https://leetcode.com/problems/power-of-two/

Given an integer, write a function to determine if it is a power of two.

Example 1:

```Input: 1
Output: true
Explanation: 20 = 1
```

Example 2:

```Input: 16
Output: true
Explanation: 24 = 16```

## Leetcode - Excel Sheet Column Number

https://leetcode.com/problems/excel-sheet-column-number/

Given a column title as appear in an Excel sheet, return its corresponding column number.

For example:

```    A -> 1
B -> 2
C -> 3
...
Z -> 26
AA -> 27
AB -> 28
...
```

Example 1:

```Input: "A"
Output: 1
```