2017

[Question] Trie Wildcard String Matching May 22, 2017

[Question] Dutch national flag problem May 13, 2017

2015

[Question] Swizzle Sort November 21, 2015

[Question] Partition Problem (divide array into halves) November 15, 2015

[Amazon] All Strings by Placing Spaces October 7, 2015

[Question] Find Cloest Leaf in Binary Tree October 7, 2015

[Question] Largest Sub-square with Edges filled October 7, 2015

[Palantir] Sort Letters Given Lexicographic Order May 21, 2015

[Question] 编程之美 NIM 一排石头的游戏 April 14, 2015

[UVa] Wooden Sticks April 14, 2015

[Palantir] Find Duplicate within K Distance April 12, 2015

[Palantir] MultiMap in Java without using Collections April 12, 2015

[LinkedIn] Sum of integer weighted by depth February 13, 2015

[LinkedIn] Unique combination of factors (因式分解) February 13, 2015

[LinkedIn] Sort part to make entire array sorted February 13, 2015

[LinkedIn] Executive's Schedule February 12, 2015

[LinkedIn] Isomorphic Strings February 11, 2015

[Question] Count multiples of array February 9, 2015

[Facebook] Generate number with Given probability February 8, 2015

[Question] Check string with no common letters (Bitmask) February 7, 2015

[Question] Reservoir sampling February 7, 2015

[Amazon] Grep command interview question February 4, 2015

[Greedy] Activity Selection Problem February 1, 2015

[Greedy] Each Employee 2 events February 1, 2015

[Question] Stock Span Problem (couting BST) February 1, 2015

[Question] 2D Bin Packing January 30, 2015

[Question] Packing Rectangles January 29, 2015

[Apple] Calculate Area January 29, 2015

[Question] Product Array Puzzle January 29, 2015

[Question] Two Dimensional Knapsack Problem January 28, 2015

[Question] Push and Pop Sequences of Stacks January 26, 2015

[Palantir] Largest basin size in matrix January 20, 2015

[Question] Check if two line segments intersect January 19, 2015

[Question] Check if given point inside polygon January 19, 2015

[Amazon] Lexicographic rank of a string January 18, 2015

[Question] Maximum square sub-matrix with all 1s January 18, 2015

[Amazon] Find nodes of distance k from Binary Tree January 17, 2015

[Question] All distinct subsequences with given length January 11, 2015

[LinkedIn] Find all repeating substring with given length January 11, 2015

[Amazon] Longest Repeating Substring January 11, 2015

[Question] Number of distinct sub-sequence January 11, 2015

[Question] Number of occurence of given sub-sequence January 11, 2015

[Amazon] Mininum Range that includes at least One January 10, 2015

[Amazon] Match triplet with reverse order January 9, 2015

[Question] Most Frequent Word from a book January 9, 2015

[Question] Longest Common Substring January 7, 2015

[Facebook] Scheduling Jobs with Max Cost January 7, 2015

[Facebook] Write a Json prettifier January 6, 2015

[Question] Frog Crossing (dynamic programming) January 2, 2015

2014

[Facebook] Maximum sum such that no two elements are adjacent December 22, 2014

[Question] Split an integer or coin December 22, 2014

[Facebook] Binary Search Tree 3Sum December 18, 2014

[Facebook] Print a Binary Tree in Vertical Order December 17, 2014

[Question] Equilibrium Points in 2D Array December 17, 2014

[Epic] Patient Disease Data Structure December 8, 2014

[Question] Axis Aligned Rectangles December 2, 2014

[Question] Multiples of 3 and 5 November 30, 2014

[Question] Find row with most 1s November 1, 2014

[Question] Interleave Positive and Negative Numbers October 8, 2014

[Question] Celebrity Problem September 11, 2014

[Facebook] Hamming Distance of Array September 1, 2014

[Twitter] Count Visible Nodes in Binary Tree August 27, 2014

[Question] Duplicate Rows in Matrix August 27, 2014

[Twitter] Largest Cycle in Permutation August 27, 2014

[Question] Count Set Bit in Binary Number August 20, 2014

[Question] Ways of Dice Throw August 20, 2014

[Question] Square Count of Matchstick Graph August 20, 2014

[Question] Count Level in Perfect Binary Tree August 19, 2014

[Twitter] Arithmetic Expression Evaluation August 17, 2014

[ItInt5] Number of Valid Trees Given Preorder and Postorder August 17, 2014

[ItInt5] Numbers Concatenation Max (Largest Number) August 17, 2014

[ItInt5] Excel Decimal Conversion August 16, 2014

[Question] Greatest Common Divisor August 15, 2014

[ItInt5] 跳马问题加强版 August 15, 2014

[Facebook] Task Scheduling Question August 15, 2014

[Facebook] Query Search (HashMap, suffix array) August 14, 2014

[ItInt5] Maximum circular subarray sum August 11, 2014

[Question] Add Integers without +/++ August 8, 2014

[Question] Decimal to Hexadecimal August 8, 2014

[Question] Max Sum Of Non-Consecutive Elements August 8, 2014

[Question] Print Numbers containing 5 August 5, 2014

[Question] Arranging Sequence August 1, 2014

[Question] Max Sum In A 2D Array (sub-matrix) August 1, 2014

[Question] Overriding private method August 1, 2014

[Question] Shuffle An Array (Fisher–Yates) August 1, 2014

[Question] Inorder Successor in Binary Search Tree July 31, 2014

[Question] Points On Globe Puzzle July 31, 2014

[Question] Run-Length Encoding July 31, 2014

[Question] Nth Fibonacci Number In O(LogN) July 30, 2014

[Question] Peripheral Of A Complete Tree July 30, 2014

[Question] Construct a BST from Preorder Traversal July 29, 2014

[Question] Find Min & Max in an Array Using Minimum Comparisons July 29, 2014

[Question] Remove chars in Pairs July 29, 2014

[Question] Which loop is faster July 29, 2014

[Question] Breaking Chocolate Bars July 28, 2014

[Question] Check If Number Exists July 28, 2014

[Question] Matching Nuts And Bolts July 28, 2014

[Question] Elephant And Bananas July 27, 2014

[Question] Fit 1*2 Dominos In 2*N Strip July 27, 2014

[Question] Reconstruct Tree From Pre-Order Traversal July 27, 2014

[Question] Random Number Generate Question July 26, 2014

[Question] Truth tell brain teaser July 26, 2014

[Question] Find 10001st Prime (Sieve of E) July 25, 2014

[Question] Find the first non-repeating character July 24, 2014

[Question] Largest palindrome product July 23, 2014

[Question] Least Number after Deleting Digits July 23, 2014

[Question] Implement Stack using Two Queues July 23, 2014

[Question] Bucket Sort (bin sort) July 22, 2014

[Question] Longest Substring with At Most Two Distinct Characters July 21, 2014

[Question] Quick Sort July 21, 2014

[Question] Max Binary Gap July 21, 2014

[Question] Check Power of 2 July 4, 2014

[Question] Subarray with 0 Sum July 4, 2014

[Question] Subarray with Particular Sum July 4, 2014

[Question] Subarray with Sum Closest July 4, 2014

[Question] Implement a HashMap July 1, 2014

[Question] Implement Queue using Stacks July 1, 2014

[Question] Median in a stream of integers July 1, 2014

[Question] Min Stack July 1, 2014

[Question] The Skyline Problem July 1, 2014

[Question] Coin Change Problem June 30, 2014

[Question] Make a fair coin from a biased coin June 30, 2014

[Question] 0-1 Knapsack Problem June 30, 2014

[Question] Single Number III June 28, 2014

[Question] Single Number IV June 28, 2014

[Question] Topology Sort June 27, 2014

[Brain teaser] Khan Academy 8 brain teasers June 26, 2014

[Question] Number Sum Sequence June 18, 2014

[Brain teaser] 2 Eggs 100 Floors Puzzle June 18, 2014

[Question] Union and Intersection of two Linked Lists June 17, 2014

[Question] Binary Search Tree find upper/lower bound June 15, 2014

[Question] Count negative in a 2D Sorted Matrix June 14, 2014

[Question] Iterator of Binary Search Tree June 14, 2014

[Question] Search Range in BST (Trim a BST) June 13, 2014

[Question] Compare Mergesort and Quicksort June 12, 2014

[Question] First Character Appearing Only Once June 10, 2014

[Question] Junit Hand-on Notes June 4, 2014

[Question] ASCII, Utf-8, Utf-16 and Unicode June 4, 2014

2013

[Question] Get Max Number Game (minmax + dp) November 21, 2013

[Question] Insert Plus and Minus to Complete Expression November 21, 2013

[Amazon] Infix to Postfix conversion November 20, 2013

[Question] Count Arithmetic Slices November 15, 2013

[Question] Shuffle and Get Max Difference November 15, 2013

[Question] Number Of Bus Stations (meeting rooms) November 5, 2013