Problem

An RNA string is a string formed from the alphabet containing ‘A’, ‘C’, ‘G’, and ‘U’.

Given a DNA string t corresponding to a coding strand, its transcribed RNA string u is formed by replacing all occurrences of ‘T’ in t with ‘U’ in u.

Given: A DNA string t having length at most 1000 nt.

Return: The transcribed RNA string of t.

Sample Dataset

GATGGAACTTGACTACGTAAATT

Sample Output

GAUGGAACUUGACUACGUAAAUU

Solution

这道题是翻译，只要把T替换成U就可以了。和上一道题《s01 - Counting DNA Nucleotides》差不多难度。

C version

#include <stdio.h>

int main() {
  FILE *INFILE;
  INFILE = fopen("DATA/rosalind_rna.txt", "rt");
  char nt;  
  while( (nt = fgetc(INFILE)) != EOF) {  
    if (nt == 'T') {
      nt = 'U';
    }
    printf("%c", nt);
  }  
  return 0;
}

Python version

FILE=open("DATA/rosalind_rna.txt", "r") dna=FILE.read() FILE.close() rna = dna.replace('T', 'U') print(rna)