1 - 传RSA加密系统已被密码学大牛破解 - cracking-rsa.txt

近日，德国密码学家克劳斯·彼得·施诺尔（Claus Peter Schnorr）在预印本网站上传论文称自己破解了RSA加密系统。

　　此事引起密码学界和量子密码界的广泛关注。上海交通大学网络空间安全学院院长谷大武教授3月4日表示，昨天看到这个消息感到很吃惊。“如果属实，这个结果是很重要的，会对部分应用产生安全影响。我们在分析这篇文章，目前还没结论。”

　　RSA是1977年由罗纳德·李维斯特（Ron Rivest）、阿迪·萨莫尔（Adi Shamir）和伦纳德·阿德曼（Leonard Adleman）一起提出的加密算法。这一算法利用大素数分解困难的特性，由于大素数之积难被分解，因此该密码就难被破解。如果想要破解密码，就需要花费很长时间进行大量运算。
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Top | 类别: 计算机科学 | 评论 (0) | 标签: RSA, 密码学, 非对称加密算法, 破解, RSA, | 中文 | 1002 次阅读, 28934 次搜索 | 540 个汉字

2 - 每日算法题: Kaprekar - kaprekar.txt.txt

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

Kaprekar's Constant is the number 6174. This number is special because it has the property where for any 4-digit number that has 2 or more unique digits, if you repeatedly apply a certain function it always reaches the number 6174.

This certain function is as follows:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 792 次阅读, 18532 次搜索 | 134 个单词

3 - 每日算法题: Making a Height Balanced Binary Search Tree - making-a-height-balanced-binary-search-tree.txt.txt

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

Given a sorted list, create a height balanced binary search tree, meaning the height differences of each node can only differ by at most 1.

Here's some code to start with:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 329 次阅读, 21210 次搜索 | 104 个单词

4 - 每日算法题: Staying on a Chess Board - staying-on-a-chess-board.txt

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

A chess board is an 8x8 grid. Given a knight at any position (x, y) and a number of moves k, we want to figure out after k random moves by a knight, the probability that the knight will still be on the chessboard. Once the knight leaves the board it cannot move again and will be considered off the board.

Here's some starter code:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 328 次阅读, 21592 次搜索 | 94 个单词

5 - 每日算法题: Multitasking - multitasking.txt

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

We have a list of tasks to perform, with a cooldown period. We can do multiple of these at the same time, but we cannot run the same task simultaneously.

Given a list of tasks, find how long it will take to complete the tasks in the order they are input.
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 822 次阅读, 20336 次搜索 | 77 个单词

6 - 每日算法题: Sort a Partially Sorted List - sort-a-partially-sorted-list.txt

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

You are given a list of n numbers, where every number is at most k indexes away from its properly sorted index. Write a sorting algorithm (that will be given the number k) for this list that can solve this in O(n log k)

Example:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 279 次阅读, 20969 次搜索 | 93 个单词

7 - 每日算法题: Most Frequent Subtree Sum - most-frequent-subtree-sum.txt

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

Given a binary tree, find the most frequent subtree sum.

Example:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 249 次阅读, 18508 次搜索 | 147 个单词

8 - 每日算法题: Fix Brackets - fix-brackets.txt

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

Given a string with only ( and ), find the minimum number of characters to add or subtract to fix the string such that the brackets are balanced.

Example:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 677 次阅读, 18445 次搜索 | 99 个单词

9 - 每日算法题: Palindrome Integers - palindrome-integers.txt

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

Given an integer, check if that integer is a palindrome. For this problem do not convert the integer to a string to check if it is a palindrome.

import math
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 273 次阅读, 20434 次搜索 | 57 个单词

10 - 每日算法题: Print a tree level-by-level, with line-breaks - print-a-tree-level-by-level,-with-line-breaks.txt

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

You are given a tree, and your job is to print it level-by-level with linebreaks.

a
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 340 次阅读, 20927 次搜索 | 111 个单词

11 - 每日算法题: Spreadsheet Columns - spreadsheet-columns.txt

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

In many spreadsheet applications, the columns are marked with letters. From the 1st to the 26th column the letters are A to Z. Then starting from the 27th column it uses AA, AB, ..., ZZ, AAA, etc.

Given a number n, find the n-th column name.
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 3260 次阅读, 21872 次搜索 | 80 个单词

12 - 每日算法题: Generate All IP Addresses - generate-all-ip-addresses.txt

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

An IP Address is in the format of A.B.C.D, where A, B, C, D are all integers between 0 to 255.

Given a string of numbers, return the possible IP addresses you can make with that string by splitting into 4 parts of A, B, C, D.
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 216 次阅读, 20038 次搜索 | 99 个单词

13 - 每日算法题: Consecutive Ones - consecutive-ones.txt

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

Return the longest run of 1s for a given integer n's binary representation.

Example:
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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 365 次阅读, 18127 次搜索 | 52 个单词

14 - 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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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 195 次阅读, 20608 次搜索 | 116 个单词

15 - 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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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 238 次阅读, 19136 次搜索 | 192 个单词

16 - 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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Top | 类别: 计算机科学 | 评论 (0) | 标签: 每日算法题, 算法, 数据结构, 面试题, Daily Interview Problem, Data Structures and Algorithms, Computer Programming, Python, | 英文 | 254 次阅读, 19592 次搜索 | 115 个单词