Codeforses - MAILRUCUP 3 (B)

Solution.java

import java.io.IOException;
import java.util.*;

public class Solution {
    public static void main(String[] args) throws IOException {
        Scanner s = new Scanner(System.in);
        StringBuilder str = new StringBuilder(s.nextLine());
        int i1=0;
        StringBuilder xxx = new StringBuilder();
        for (int i = 1; i <= 5; i++) {
            double kek = (double) str.length() / i;
            if (kek <= 20) {
                if (i == 1) {
                    System.out.println(str);
                    break;
                }else if(kek%1==0) {
                    String[] mass = str.toString().split("");
                    for (int j = 0; j < mass.length; j++) {
                        if (j%kek==0&&j!=0) xxx.append("\n");
                        xxx.append(mass[j]);
                    }
                    System.out.println(xxx);
                    break;
                }else {
                    ArrayList<String> list = new ArrayList<>(Arrays.asList(str.toString().split("")));
                    if (i1==0) list.add(0, "*"); else
                        list.add(i1*(int)kek+1, "*");
                        i1++;
                        if (i1>i) i1=0;
                        str = new StringBuilder();
                    for (String s2 : list) {
                        str.append(s2);
                    }
                    i--;
                }
            }

        }
    }
}