I was coding problem 384D - Вулканы after reading the editorial.
I keep getting wrong answer. I traced the code and tried all the small tests in the test cases but still can't find the bug.
The test case I fail in is large so I can't get a hold of it
Help is really appreciated. Here is my code:

[Edit]: I found the bug, thanks :)

I've been debugging this for a while and I still can't tell why it exceeds the memory limit.
Can somebody help me?
Submission: 5723491

I was solving problem C from the last testing round 386C - Diverse Substrings
The idea I got was to handle substrings starting at different indices separately:
   1. You will do a precomputation next[i][26] telling you the next occurrence of each of the lower case letters from index i.
   2. You start at index i and each time you jump to the unseen character (using the precomputed array) with the least next occurrence    say k and all substrings starting at i and ending between the last jump and the current jump has diversity of the size of seen    characters so far.
The implementation was direct 5706503 and it was accepted.
I was playing around to optimize it when I thought I shouldn't loop on all characters and check what has been seen or not but instead maintain an actual set of the unseen characters so far and loop over them exclusively. The implementation was direct too 5706533.
To my surprise, this code timed out. I still can't explain why, it's supposed to be doing less loop iterations and hence less comparisons.
Any help would be appreciated.

I expected a new year's eve round :(

Can someone tell me how this code exceeds 256MB? where n is at most 5k.

import java.awt.Point;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.HashMap;
import java.util.LinkedList;

public class G {
    public static void main(String[] args) throws NumberFormatException,
            IOException {
        BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
        PrintWriter out = new PrintWriter(System.out);
        int n = Integer.parseInt(in.readLine());
        Point[] E = new Point[n];
        HashMap<String, Integer> H = new HashMap<String, Integer>();
        String[] N = new String[n * 2];
        int index = 0;
        for (int i = 0; i < n; i++) {
            String[] S = in.readLine().split(" ");
            if (!H.containsKey(S[0]))
                H.put(S[0], index++);
            if (!H.containsKey(S[1]))
                H.put(S[1], index++);
            int x = H.get(S[0]);
            N[x] = S[0];
            int y = H.get(S[1]);
            N[y] = S[1];
            E[i] = new Point(x, y);
        }
        boolean[][] F = new boolean[index][index];
        for (int i = 0; i < n; i++)
            F[E[i].x][E[i].y] = F[E[i].y][E[i].x] = true;
        short[][] C = new short[index][index];
        for (int i = 0; i < n; i++)
            for (int j = i + 1; j < n; j++) {
                int o1 = -1, o2 = -1;
                if (E[i].x == E[j].x) {
                    o1 = E[i].y;
                    o2 = E[j].y;
                } else if (E[i].x == E[j].y) {
                    o1 = E[i].y;
                    o2 = E[j].x;
                } else if (E[i].y == E[j].x) {
                    o1 = E[i].x;
                    o2 = E[j].y;
                } else if (E[i].y == E[j].y) {
                    o1 = E[i].x;
                    o2 = E[j].x;
                }
                if (o1 == -1)
                    continue;
                if (!F[o1][o2]) {
                    C[o1][o2]++;
                    C[o2][o1]++;
                }
            }
        out.println(index);
        for (int i = 0; i < index; i++) {
            int max = Integer.MIN_VALUE;
            for (int j = 0; j < index; j++)
                max = Math.max(max, C[i][j]);
            int cnt = 0;
            for (int j = 0; j < index; j++)
                if (C[i][j] == max && !F[i][j] && i != j)
                    cnt++;
            out.println(N[i] + " " + cnt);
        }
        out.flush();
        out.close();
    }
}

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