## GUPTA MECHANICAL

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

For encoding an even-length binary string into a sequence of ATC, 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 $S$ of length $N$ ($N$ is even), find the encoded sequence.

### Input Format

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

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

### Output Format

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

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Note: Output is case-sensitive.

### Constraints

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