DNA to RNA Transcription

Build an RNA string by replacing every DNA character with its partner. Use this complete mapping: A → U, C → G, G → C, T → A. Preserve the original order. No biology knowledge is needed.

Implement dna_to_rna(dna).

Input

dna: The DNA string to transform.

Output

Return the transformed string. Empty input returns an empty string.

Contraintes

0 ≤ DNA length ≤ 100,000. Characters are uppercase A, C, G, or T.

Exemples

Entrée :
dna = "ACGT"

Sortie attendue :
expected = "UGCA"

Entrée :
std::string dna = "ACGT";

Sortie attendue :
std::string expected = "UGCA";

Entrée :
string dna = "ACGT";

Sortie attendue :
string expected = "UGCA";

Entrée :
dna = ""

Sortie attendue :
expected = ""

Entrée :
std::string dna = "";

Sortie attendue :
std::string expected = "";

Entrée :
string dna = "";

Sortie attendue :
string expected = "";

Références

Ce défi a été adapté pour CodeUtility. Suivez l'énoncé et les contraintes ci-dessus.

• Exercism: RNA Transcription