k-mer

/*
 * 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.
 */

//package javaapplication11;

/**
 *
 * @author tuukkatu
 */
public class JavaApplication11 {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        
        
        IO io = new IO();
        String a = io.next();
        
        io.println(kMer(a));
        io.close();
    }
    
    private static String kMer(String dna) {
        int maijaCounter = 0;
        int kaaleppiCounter = 0;

        if (dna.length() < 4)
        {
            return "not sure";
        }
        
        for (int i = 0; i < dna.length() - 3; i++) {
            if (dna.charAt(i) == 'A') {
                if (dna.charAt(i + 1) == 'T') {
                    if (dna.charAt(i + 2) == 'A') {
                        if (dna.charAt(i + 3) == 'T') {
                            kaaleppiCounter++;
                        }
                    }
                }
            }

            if (dna.charAt(i) == 'G') {
                if (dna.charAt(i + 1) == 'C') {
                    if (dna.charAt(i + 2) == 'G') {
                        if (dna.charAt(i + 3) == 'C') {
                            maijaCounter++;
                        }
                    }
                }
            }
        }

        if (maijaCounter > kaaleppiCounter) {
            return "Maija";
        }

        if (maijaCounter < kaaleppiCounter) {
            return "Kaaleppi";
        }

        return "not sure";
    }
    
    
}

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

Test 17

Verdict: ACCEPTED

Test 18

Verdict: ACCEPTED

Test 19

Verdict: ACCEPTED

Test 20

Verdict: ACCEPTED

Test 21

Verdict: ACCEPTED

Test 22

Verdict: ACCEPTED

Test 23

Verdict: ACCEPTED

Test 24

Verdict: ACCEPTED

Test 25

Verdict: ACCEPTED

Test 26

Verdict: ACCEPTED

Test 27

Verdict: ACCEPTED

Test 28

Verdict: ACCEPTED

Test 29

Verdict: ACCEPTED

Test 30

Verdict: ACCEPTED