Battle Simulation

import java.util.ArrayDeque;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Deque;
import java.util.PriorityQueue;
import java.util.Queue;

public class Kilpalaatikko {

    public static void main(String[] args) {
        IO io = new IO();
        String s = io.next();
        int n = s.length();
        char[] c = s.toCharArray();
        for (int i = 0; i < n; i++) {
            if (c[i] == 'R') {
                c[i] = 'S';
            }
            if (c[i] == 'B') {
                c[i] = 'K';
            }
            if (c[i] == 'L') {
                c[i] = 'H';
            }
        }
        for (int i = 0; i < n; i++) {
            if (i + 2 >= n || (c[i] == c[i + 1] || c[i] == c[i + 2] || c[i + 1] == c[i + 2])) {
                io.print(c[i]);
            } else {
                io.print("C");
                i += 2;
            }
        }

        io.close(); // TÄYTYY KUTSUA LOPUKSI, muuten tuloste voi jäädä kirjoittamatta

    }

}

class pari implements Comparable<pari> {

    int x;
    int y;
    int z;

    public pari(int x, int y, int z) {
        this.x = x;
        this.y = y;
        this.z = z;
    }

    public int getX() {
        return x;
    }

    public void setX(int x) {
        this.x = x;
    }

    public int getY() {
        return y;
    }

    public void setY(int y) {
        this.y = y;
    }

    @Override
    public int compareTo(pari o) {
        return -o.y + this.y;
    }

}

Test 1

Verdict: ACCEPTED

Test 2

Verdict: ACCEPTED

Test 3

Verdict: ACCEPTED

Test 4

Verdict: ACCEPTED

Test 5

Verdict: ACCEPTED

Test 6

Verdict: ACCEPTED

Test 7

Verdict: ACCEPTED

Test 8

Verdict: ACCEPTED

Test 9

Verdict: ACCEPTED

Test 10

Verdict: ACCEPTED

Test 11

Verdict: ACCEPTED

Test 12

Verdict: ACCEPTED

Test 13

Verdict: ACCEPTED

Test 14

Verdict: ACCEPTED

Test 15

Verdict: ACCEPTED

Test 16

Verdict: ACCEPTED