Merkkijonot

import java.util.List;
import java.util.ArrayList;
import java.lang.Character;
import java.lang.System;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;


class merkkijonot {
    public static void main(String[] args)throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        int n = Integer.parseInt(reader.readLine());

        List<String> strings = new ArrayList<String>();
        List<String> nums = new ArrayList<String>();

        for (int i = 0; i < n; i++) {
            String string = reader.readLine();
            strings.add(string);
        }
        reader.close();

        //final long start = System.currentTimeMillis();
        for (String str : strings) {
            String output = str;
            for (int i = 0; i < output.length(); i++) {
                char chr = output.charAt(i);
                if (Character.toString(chr).matches("-?\\d+(\\.\\d+)?") == false) {
                    output = output.replaceAll(String.valueOf(chr), Integer.toString(i));
                }
            }
            nums.add(output);
        }
        int output = 0;
        for (int a = 0; a < nums.size(); a++) {
            for (int b = a + 1; b < nums.size(); b++) {
                if (nums.get(a).equals(nums.get(b))) {
                    output += 1;
                }
            }
        }
        //final long end = System.currentTimeMillis();
        System.out.println(output);
        //System.out.println("Total time: " + (end - start) + "ms");
    }
}

Test 1

Group: 1, 2, 3

Verdict: ACCEPTED

Test 2

Group: 2, 3

Verdict: ACCEPTED

Test 3

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 4

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 5

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 6

Group: 1, 2, 3

Verdict: ACCEPTED

Test 7

Group: 1, 2, 3

Verdict: ACCEPTED

Test 8

Group: 1, 2, 3

Verdict: ACCEPTED

Test 9

Group: 1, 2, 3

Verdict: ACCEPTED

Test 10

Group: 2, 3

Verdict: ACCEPTED

Test 11

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 12

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 13

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 14

Group: 2, 3

Verdict: TIME LIMIT EXCEEDED

Test 15

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 16

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 17

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 18

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 19

Group: 3

Verdict: TIME LIMIT EXCEEDED

Test 20

Group: 1, 2, 3

Verdict: ACCEPTED

Test 21

Group: 1, 2, 3

Verdict: ACCEPTED

Test 22

Group: 1, 2, 3

Verdict: ACCEPTED

Test 23

Group: 1, 2, 3

Verdict: ACCEPTED

Test 24

Group: 1, 2, 3

Verdict: ACCEPTED