题解 | #游游的字母翻倍#

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);
        int len = in.nextInt();
        int n = in.nextInt();
        String s = in.next();
        StringBuilder sb = new StringBuilder(s);
        for(int t=0;t<n;t++){
            int a = in.nextInt();
            int b = in.nextInt();
            for(int i=a-1;i<b;i+=2){
                sb.insert(i,sb.charAt(i));
                b++;
            }
        }
        System.out.println(sb.toString());
    }
}