题解 | #DNA序列#正则
DNA序列
https://www.nowcoder.com/practice/e8480ed7501640709354db1cc4ffd42a
import java.util.Scanner;
// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
// 注意 hasNext 和 hasNextLine 的区别
while (in.hasNextLine()) { // 注意 while 处理多个 case
String str = in.nextLine();
int n = Integer.valueOf(in.nextLine());
double finalRatio = 0.0000;
String res = str;
for (int l = 0; l < str.length() - n; l++) {
String son = str.substring(l, l + n);
String temp = son.replaceAll("[G,C]", "");
double ratio = (n - temp.length()) * 1.0000 / n;
if (ratio > finalRatio) {
finalRatio = ratio;
res = son;
}
}
System.out.println(res);
}
}
}
