参考代码:
import java.util.Scanner; public class Main { public static void main(String[] args) { Scanner scanner = new Scanner(System.in); System.out.println(dna(scanner.next())); } public static String dna(String s) { String res = ""; for(char c: s.toCharArray()) if(c == 'A') res += 'T'; else if(c == 'T') res += 'A'; else if(c == 'C') res += 'G'; else if(c == 'G') res += 'C'; return res; } }
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