原创 Design a valet parking system.
Design a valet parking system. Requirements of the valet parking system should be: 1. Customer are given a ticket that
2020-06-11 05:01:02
原创 Remove Node in Binary Search Tree
This is one of the pretty interesting technical interview questions I see, it is rather fundamental, you probably have
2018-08-24 20:41:53
2
原创 Lowest Common Ancestor (LCA) of two nodes in graph
In graph theory and computer science, the lowest common ancestor (LCA) of two nodes v and w in a tree or directed
2018-08-24 20:41:49
1
原创 OOD - Arithmetic Expression Tree
package OO_Problems; public class ArithmeticExpressionTree { public interface AENode{ public double evaluate() thro
2018-08-24 20:41:48
原创 這兩道題的區別 LeetCode Permutations 和 LeetCode Combinations
刷第一遍的時候覺得這兩道題巨尼瑪像，但是爲啥一個用了isVisited boolean數組，一個就是正常iterate。 刷第二遍的時候終於醒悟了： 1，Permutation - Order Matters!!!!! 要回溯，[1,4
2018-08-24 20:41:46
1
原创 Two Sum Closest to K
An Array of integers is given, both +ve and -ve. You need to find the two elements such that their sum is closest to ta
2018-08-24 20:41:45
1
原创 How to compare 2 arrays in java
<pre name="code" class="java">// we need to import java.util.Arrays to use Arrays.equals(). import java.util.Arrays; cl
2018-08-24 20:41:45
原创 Maze problem 的OO Design - 寫給煜小堆
Question: How do you design a Maze and what kind of data structures you use for Maze. In addition, w
2018-08-24 20:41:45