Osajono

/**
 * Created by Frans on 04/10/2015.
 */
import java.util.*;

public class Osajono {
    public static void main(String[] args) {
        IO io = new IO();

        String txt = io.next();

        long[] amount = new long[Character.MAX_VALUE];

        for (int i=0; i < txt.length(); i++){
            amount[txt.charAt(i)] ++;
        }

        long sum = 0;

        for (int i = 0; i < amount.length; i++){
            sum += (amount[i]*(amount[i]+1))/2;
        }

        io.println(sum);
        io.close();
    }
}

Test 1

Group: 1

Verdict: ACCEPTED

Test 2

Group: 1

Verdict: ACCEPTED

Test 3

Group: 1

Verdict: ACCEPTED

Test 4

Group: 1

Verdict: ACCEPTED

Test 5

Group: 1

Verdict: ACCEPTED

Test 6

Group: 2

Verdict: ACCEPTED

Test 7

Group: 2

Verdict: ACCEPTED

Test 8

Group: 2

Verdict: ACCEPTED

Test 9

Group: 2

Verdict: ACCEPTED

Test 10

Group: 2

Verdict: ACCEPTED

Test 11

Group: 3

Verdict: ACCEPTED

Test 12

Group: 3

Verdict: ACCEPTED

Test 13

Group: 3

Verdict: ACCEPTED

Test 14

Group: 3

Verdict: ACCEPTED

Test 15

Group: 3

Verdict: ACCEPTED