题解 | 约瑟夫环

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 n = in.nextInt();
        int k = in.nextInt();
        int m = in.nextInt();
        StringBuffer sb = new StringBuffer();
        for(int i = 0; i < n; i++){
            sb.append((char)('A' + i));
        }
        int currentindex = k;
        while(sb.length() > 1){
            currentindex = (currentindex + m - 1) % sb.length();//核心步骤
            sb.deleteCharAt(currentindex);
            if(currentindex >= sb.length()){
                currentindex = 0;
            }
        }
        int king = sb.charAt(0) - 'A';//核心
        System.out.print(king);
    }
}