# Lists

Write a function that remove duplicates from a list:
for example:
```
[1, 3, 5, 3, 7, 3, 1, 1, 5]
```
should return
```
[1, 3, 5, 7]
```

Write a function that count each elements in a list:
for example:
```
[1, 3, 5, 3, 7, 3, 1, 1, 5]
```
should become
```
{
  1: 3,
  3: 3,
  5: 2,
  7: 1
}
```

# Run-Length Encoding

Run-Length Encoding is a simple compression scheme. You replace consecutive
occurence of the same later by the number of time it appears followed by the
letter. You can suppose the string will only have letter from A to Z.

Example:
```
WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW
```
is compressed to:
```
12W1B12W3B24W1B14W
```

# Run-Length Decoding

Write the function to decode results from previous exercise:
```
12W1B12W3B24W1B14W
```
should give:
```
WWWWWWWWWWWWBWWWWWWWWWWWWBBBWWWWWWWWWWWWWWWWWWWWWWWWBWWWWWWWWWWWWWW
```

# FizzBuzz

Write a `fizzbuzz` function that takes no parameter
as input and print in the console the numbers from 1
to 100 and replace the number by:
  - Fizz if it is divisible by 3
  - Buzz if it is divisible by 5
  - FizzBuzz if it is divisible by both

The beginning of the output should be:
```
1
2
Fizz
4
Buzz
Fizz
7
8
Fizz
Buzz
11
Fizz
13
14
FizzBuzz
16
```


# Dictionnary changes

Write a function `replace_dashes` that takes a
dictionnary as input and rename the keys so that
every '_' is replaced by '-'.
Your function should not change the values, for
example, if the input is:
```
{
  "key_1": "value_1",
  "key_2": "value_2",
  "key_3": {
    "key_4": "value_4"
  }
}
```
its output should be:
```
{
  "key-1": "value_1",
  "key-2": "value_2",
  "key-3": {
    "key-4": "value_4"
  }
}
```
You can suppose that the input will be a valid JSON
object.


# Counting
Write a program that outputs all possibilities to put + or - or nothing between
the numbers 1,2,…,9 (in this order) such that the result is 100.
For example
```
1 + 2 + 3 - 4 + 5 + 6 + 78 + 9 = 100
```