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/**
 * Definition for binary tree
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {

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public class LRUCache {
    
    Node head;
    int capacity;
    
    class Node {
        int key;
        int value;
        Node prev;
        Node next;

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public class Solution {
    int[] A;
    int target;
    public int[] searchRange(int[] A, int target) {
        this.A = A;
        this.target = target;
        int s = find0();
        return new int[]{s, (s==-1) ? -1: find1(s) };
    }
    

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public class Solution {
     public int search(int[] A, int target) {
      int res = -1;
      if (A != null && A.length > 0) {
          int s = 0, e = A.length-1;
          int mid = 0;
          while (s < e) {
              mid = (s+e) >>> 1;
              
              if (A[mid] == target) {

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public class Solution {
    public int sqrt(int x) {
        int s = 1, e = x, res = x;
        int max_res = (int)Math.pow(2, 16);
        
        while (s < e) {
            int mid = (s + e) >>> 1;
            int sqr = mid * mid;
            res = mid;
            

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public class Solution {
   
    public boolean isNumber(String s) {
        
        if (s == null) return false;
        s = s.trim();
        if (s.length() == 0) return false;
        s = s+ ' ';
        
        State state = State.INIT;

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package leetcode;

import java.util.HashSet;
import java.util.PriorityQueue;
import java.util.Set;

public class Solution {

    public static void main(String[] args) {
        int[][] matrix = {

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public class Solution {

    public int maxElementPath(int[][] matrix) {

        int res = 0;
        if (matrix != null) {
            int height = matrix.length;
            int width = height > 0 ? matrix[0].length : 0;

            for (int i = 0; i < height; i++) {

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    /**
     * Maximum Subarray
     * Find the contiguous subarray within an array (containing at least one number) which has the largest sum.
     * <p/>
     * For example, given the array [−2,1,−3,4,−1,2,1,−5,4],
     * the contiguous subarray [4,−1,2,1] has the largest sum = 6.
     * https://oj.leetcode.com/problems/maximum-subarray/
     */
public class Solution {
    public int maxSubArray(int[] arr) {

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/**
 * Definition for binary tree
 * public class TreeNode {
 *     int val;
 *     TreeNode left;
 *     TreeNode right;
 *     TreeNode(int x) { val = x; }
 * }
 */
public class Solution {