Short blog this week, because this seems relatively straight forward, so doesn't need much explanation.

# TASK #1 › Triplet Sum

It seems the majority of solutions for task 2 of challenge 083 was to use binary operations to flip bits.

I did the same for this task. Counting from `7`

(the smallest number with three bits set) to `2 ** scalar(numbers) - 1`

, I check if that number has only 3 bits set, and use this to decide what numbers to sum. If `1 < $sum < 2`

, then I print the result. If I reach the end of the array, I print `0`

.

## Examples

```
» ./ch-1.pl 1.2 0.4 0.1 2.5
Output: 1 as 1 < 1.2 + 0.4 + 0.1 < 2
» ./ch-1.pl 0.2 1.5 0.9 1.1
Output: 0
» ./ch-1.pl 0.5 1.1 0.3 0.7
Output: 1 as 1 < 0.5 + 1.1 + 0.3 < 2
```

# TASK #2 › Power of Two Integers

Let's start with Math 101. The formula to find the nth root is x^{(1 ÷ n)}. Have said that Perl 5.30 has a very odd quirk, probably due to a precision rounding error.

```
# perl -E 'say 125**(1/3)'
5
# perl -E 'say int(125**(1/3))'
4
```

To work around this, I use a counter for the power value, starting at two. I use the nth root and sprintf to get the nearest integer, and then return true that integer ** power is the target value. Definitely a lot more messier than I would have liked.`

## Examples

```

» ./ch-2.pl 8

Output: 1 as 8 = 2 ^ 3

» ./ch-2.pl 15

Output: 0

» ./ch-2.pl 125

Output: 1 as 125 = 5 ^ 3

`

## Discussion