17 - Absolute Path - absolute-path.txt

Hi, here's your problem today. This problem was recently asked by Facebook:

Given a file path with folder names, '..' (Parent directory), and '.' (Current directory), return the shortest possible file path (Eliminate all the '..' and '.').

Example
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18 - Design Tic-Tac-Toe - design-tic-tac-toe.txt

Hi, here's your problem today. This problem was recently asked by Google:

Design a Tic-Tac-Toe game played between two players on an n x n grid. A move is guaranteed to be valid, and a valid move is one placed on an empty block in the grid. A player who succeeds in placing n of their marks in a horizontal, diagonal, or vertical row wins the game. Once a winning condition is reached, the game ends and no more moves are allowed. Below is an example game which ends in a winning condition:

Given n = 3, assume that player 1 is "X" and player 2 is "O"
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19 - Top K Frequent words - top-k-frequent-words.txt

Hi, here's your problem today. This problem was recently asked by AirBNB:

Given a non-empty list of words, return the k most frequent words. The output should be sorted from highest to lowest frequency, and if two words have the same frequency, the word with lower alphabetical order comes first. Input will contain only lower-case letters.

Example:
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20 - Detect Linked List Cycle - detect-linked-list-cycle.txt

Hi, here's your problem today. This problem was recently asked by Uber:

Given a linked list, determine if the linked list has a cycle in it. For notation purposes, we use an integer pos which represents the zero-indexed position where the tail connects to.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | 208 Views, 20198 Search Bots | 120 Words

21 - Plus One - plus-one.txt

Hi, here's your problem today. This problem was recently asked by LinkedIn:

Given a non-empty array where each element represents a digit of a non-negative integer, add one to the integer. The most significant digit is at the front of the array and each element in the array contains only one digit. Furthermore, the integer does not have leading zeros, except in the case of the number '0'.

Example:
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22 - Find Missing Numbers in an Array - find-missing-numbers-in-an-array.txt

Hi, here's your problem today. This problem was recently asked by Twitter:

Given an array of integers of size n, where all elements are between 1 and n inclusive, find all of the elements of [1, n] that do not appear in the array. Some numbers may appear more than once.

Example:
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23 - Binary Tree Level with Minimum Sum - binary-tree-level-with-minimum-sum.txt

Hi, here's your problem today. This problem was recently asked by Twitter:

You are given the root of a binary tree. Find the level for the binary tree with the minimum sum, and return that value.

For instance, in the example below, the sums of the trees are 10, 2 + 8 = 10, and 4 + 1 + 2 = 7. So, the answer here should be 7.
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24 - Algorithm Interview: Lowest Common Ancestor of 2 Nodes in Binary Tree - lowest-common-ancestor-of-2-nodes-in-binary-tree.txt

Hi, here's your problem today. This problem was recently asked by Apple:

You are given the root of a binary tree, along with two nodes, A and B. Find and return the lowest common ancestor of A and B. For this problem, you can assume that each node also has a pointer to its parent, along with its left and right child.

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25 - Algorithm Interview: Shifted String - shifted-string.txt

Hi, here's your problem today. This problem was recently asked by Apple:

You are given two strings, A and B. Return whether A can be shifted some number of times to get B.

Eg. A = abcde, B = cdeab should return true because A can be shifted 3 times to the right to get B. A = abc and B= acb should return false.
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26 - Algorithm Interview: Level Order Traversal of Binary Tree - level-order-traversal-of-binary-tree.txt

Hi, here's your problem today. This problem was recently asked by Microsoft:

Given the root of a binary tree, print its level-order traversal. For example:

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27 - Algorithm Interview: Determine If Linked List is Palindrome - determine-if-linked-list-is-palindrome.txt

Hi, here's your problem today. This problem was recently asked by Microsoft:

You are given a doubly linked list. Determine if it is a palindrome.

Can you do this for a singly linked list?
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | 177 Views, 22439 Search Bots | 102 Words

28 - Algorithm Interview: Subarray With Target Sum - subarray-with-target-sum.txt

Hi, here's your problem today. This problem was recently asked by Amazon:

You are given an array of integers, and an integer K. Return the subarray which sums to K. You can assume that a solution will always exist.

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29 - Algorithm Interview: Longest Consecutive Sequence - longest-consecutive-sequence.txt

Hi, here's your problem today. This problem was recently asked by Amazon:

You are given an array of integers. Return the length of the longest consecutive elements sequence in the array.

For example, the input array [100, 4, 200, 1, 3, 2] has the longest consecutive sequence 1, 2, 3, 4, and thus, you should return its length, 4.
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30 - Algorithm Interview: Permutations of numbers - permutations-of-numbers.txt

Hi, here's your problem today. This problem was recently asked by Facebook:

You are given an array of integers. Return all the permutations of this array.

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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python,  | English | 198 Views, 20820 Search Bots | 38 Words

31 - Algorithm Interview: Maximum Path Sum in Binary Tree - maximum-path-sum-in-binary-tree.txt

Hi, here's your problem today. This problem was recently asked by Facebook:

You are given the root of a binary tree. Find the path between 2 nodes that maximizes the sum of all the nodes in the path, and return the sum. The path does not necessarily need to go through the root.

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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python,  | English | 215 Views, 21382 Search Bots | 116 Words

32 - Algorithm Interview: Smallest Number that is not a Sum of a Subset of List - smallest-number-that-is-not-a-sum-of-a-subset-of-list.txt

Hi, here's your problem today. This problem was recently asked by AirBNB:

Given a sorted list of positive numbers, find the smallest positive number that cannot be a sum of any subset in the list.

Example:
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Top | Category: Computing | Comments (0) | Tags: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | English | 163 Views, 41503 Search Bots | 66 Words