[Solution] DNA Storage CodeChef Solution | CodeChef Problem Solution 2022

[Solution] DNA Storage CodeChef Solution | CodeChef Problem Solution 2022

For encoding an even-length binary string into a sequence of A, T, C, and G, we iterate from left to right and replace the characters as follows:

• 00 is replaced with A
• 01 is replaced with T
• 10 is replaced with C
• 11 is replaced with G

Given a binary string S$S$ of length N$N$ (N$N$ is even), find the encoded sequence.

Input Format

• First line will contain T$T$, number of test cases. Then the test cases follow.

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• Each test case contains two lines of input.
• First line contains a single integer N$N$, the length of the sequence.
• Second line contains binary string S$S$ of length N$N$.

Output Format

For each test case, output in a single line the encoded sequence.

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Note: Output is case-sensitive.

Constraints

• 1≤T≤100$1\le T\le 100$
• 2≤N≤103$2\le N\le {10}^3$
• N$N$ is even.
• Sum of N$N$ over all test cases is at most 103${10}^3$.
• S$S$ contains only characters 0 and 1