Stones

/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */

/**
 *
 * @author viljampa
 */
public class Kivet {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        IO io = new IO();
        String a = io.next();
//        String a = "BRGBG";
//	String a = io.next(); // Lukee seuraavan välein erotellun merkkijonon.
//	int b = io.nextInt(); // Lukee seuraavan välein erotellun int-kokonaisluvun.
//	long c = io.nextLong(); // Lukee seuraavan välein erotellun long-kokonaisluvun.
//	double d = io.nextDouble(); // Lukee seuraavan välein erotellun double-liukuluvun.
	
	// Toimii kuten System.out.println.
        int poistettava = 0;
        int edellinen = 0;
        for (int i = 1; i < a.length(); i++) {
            if (a.charAt(i) == a.charAt(edellinen)) {
                poistettava++;
            } else {
                edellinen = i;
            }
        }
	io.println(poistettava);
	
	io.close();
    }
    
}

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