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private static String buildProducts(String parts) {
        int acumA = 0;
        int acumB = 0;
        int acumC = 0;
        int acumD = 0;
        int acumE = 0;
        
        for (int i = 0;  i < parts.length(); i++) {
             switch (parts.charAt(i)) {
                 case 'a' : ++acumA;

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    private static int findKthSmallestNumber3(int[] data, int low, int high, int k) {
        if (k > 0 && k <=  high - low + 1) {
            int partitionCalculated = partition(data, low, high);

            if (partitionCalculated - 1 == k -1 ) {
                return data[partitionCalculated - 1 ];
            }

            if (partitionCalculated - 1 > k -1) {
                return findKthSmallestNumber3(data, low, partitionCalculated - 1, k);

zeitan

public class LRUCache {

    class Entry {
        int key;
        int value;
        Entry left;
        Entry right;
        public Entry(int key, int value, Entry left, Entry right) {
            this.key = key;
            this.value = value;

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    private static Set<Set<Integer>> calculatePowerSet(Set<Integer> list) {
        int size = list.size();
        Set<Set<Integer>> powerSet = new HashSet<>();
        powerSet.add(Collections.EMPTY_SET);
        if (size == 0) {
            return powerSet; 
        }
        Integer[] elems = list.toArray(new Integer[size]);
        int end = (int) Math.pow(2, size) - 1;
        for (int i=1; i<= end; i++) {

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    class Pair<T,S> {
        T fst;
        S snd;
        public Pair(T fst, S snd) {
            this.fst = fst;
            this.snd = snd;
        }
    }

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class Trie {
    String key;
    Trie[] character = null;

    // Constructor
    Trie()
    {
        // Trie supports lowercase English characters (a - z)
        // so character size is 26
        character = new Trie[26];

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    private static boolean checkSumInTree(TreeNode root, int k) {
        if (root != null)
            return checkSumInTreeAcum(root, k, 0);
        else
            return false;
    }

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    private static boolean areSame(String arr)
    {
        char first = arr.charAt(0);
        for (int i = 1; i < arr.length(); i++)
            if (arr.charAt(i) != first)
                return false;
        return true;
    }

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    public static int calculateMaxShipment(List<Shipment> shipmentList) {
        int highShipment = -1;
        int counter = 0;
        Map<Integer, Integer> hours = new TreeMap<>();
        for (Shipment shipment : shipmentList) {
            hours.put(shipment.in, hours.getOrDefault(shipment.in, 0) + 1);
            hours.put(shipment.out, hours.getOrDefault(shipment.out, 0) - 1);
        }
        
        for (Map.Entry<Integer, Integer> hourEntry : hours.entrySet()) {

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import java.util.Map;
import java.util.TreeMap;
import java.util.Arrays;
import java.util.Set;
import java.util.TreeSet;

public class Strobogrammatic {
    private Map<Integer, String[]> numbersGenerated = new TreeMap<>();

    public Strobogrammatic(int initialSize) {