49 - 每日算法题: Spreadsheet Column Title - spreadsheet-column-title.txt.txt

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

MS Excel column titles have the following pattern: A, B, C, ..., Z, AA, AB, ..., AZ, BA, BB, ..., ZZ, AAA, AAB, ... etc. In other words, column 1 is named "A", column 2 is "B", column 26 is "Z", column 27 is "AA" and so forth. Given a positive integer, find its corresponding column name.
Examples:
Input: 26
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50 - 每日算法题: Compare Version Numbers - compare-version-numbers.txt

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

Version numbers are strings that are used to identify unique states of software products. A version number is in the format a.b.c.d. and so on where a, b, etc. are numeric strings separated by dots. These generally represent a hierarchy from major to minor changes. Given two version numbers version1 and version2, conclude which is the latest version number. Your code should do the following:
If version1 > version2 return 1.
If version1 < version2 return -1.
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51 - 每日算法题: Reverse a Directed Graph - reverse-a-directed-graph.txt

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

Given a directed graph, reverse the directed graph so all directed edges are reversed.

Example:
...
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52 - 每日算法题: 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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53 - 每日算法题: 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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54 - 每日算法题: 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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55 - 每日算法题: 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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56 - 每日算法题: 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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57 - 每日算法题: 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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58 - 每日算法题: 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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59 - 算法题 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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60 - 算法题 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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61 - 算法题 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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62 - 算法题 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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63 - 算法题 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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64 - 算法题 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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