# Print All N Length Strings from Given Number K

Objective: Given Number K, Print all the strings of N length.

Example:

```N = 2, K = 3

[1, 1] [2, 1] [3, 1] [1, 2] [2, 2] [3, 2] [1, 3] [2, 3] [3, 3]
```

Approach:

This problem is quite similar to Print All Subsets of a given set and Print All Combinations of subset of size K from Given Array

• Loop through i = 1 to K.
• Add i to the result Array, which is the size N and make a recursive call to (N-1).
• Base case: when n becomes 0 (means array is full).
• See the code for better explanation.

Code:

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 import java.util.*; public class NLengthStringFromKNumbers { public void print(int n, int k, int[] A) { if (n <= 0) { System.out.println(Arrays.toString(A)); } else { for (int i = 1; i <= k; i++) { A[n – 1] = i; print(n – 1, k, A); } } } public static void main(String[] args) { int n = 2; int k = 3; NLengthStringFromKNumbers i = new NLengthStringFromKNumbers(); i.print(n, k, new int[n]); } }

```Output:
[1, 1]
[2, 1]
[3, 1]
[1, 2]
[2, 2]
[3, 2]
[1, 3]
[2, 3]
```

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