# HackerRank Concatenate an array with itself problem solution

In this HackerRank Concatenate an array with itself problem solution we have given a list of countries, each on a new line, your task is to read them into an array. Then, concatenate the array with itself (twice) - so that you have a total of three repetitions of the original array - and then display the entire concatenated array, with a space between each of the countries' names.

Input Format

A list of country names. The only characters present in the country names will be upper or lower-case characters and hyphens.

Output Format

Display the entire concatenated array, with a space between each of them.

## Problem solution.

```arr=(\$(cat))
printf "\${arr[*]} \${arr[*]} \${arr[*]}"```

## Second solution.

```while read country
do
countries=("\${countries[@]}" \$country)
done
for i in `seq 1 3`
do
echo -n "\${countries[@]} "
done
```

## Third solution.

```#! /bin/bash

do
array[\${#array[@]}]=\$line
done
echo "\${array[@]} \${array[@]} \${array[@]}"
```

## Fourth solution.

```ARRAY=()
ARRAY+=(\$line)
done;
RESULT=()
for i in `seq 0 \${#ARRAY[@]}`; do
RESULT+=(\${ARRAY[\$i]})
done;
for i in `seq 0 \${#ARRAY[@]}`; do
RESULT+=(\${ARRAY[\$i]})
done;
for i in `seq 0 \${#ARRAY[@]}`; do
RESULT+=(\${ARRAY[\$i]})
done;
echo \${RESULT[@]}
```