Digit factorials: Find the Sum of All the Curious Numbers

  • 时间：2020-09-10 12:45:51
  • 分类：网络文摘
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145 is a curious number, as 1! + 4! + 5! = 1 + 24 + 120 = 145. Find the sum of all numbers which are equal to the sum of the factorial of their digits. Note: as 1! = 1 and 2! = 2 are not sums they are not included. Pre-computing the Digit... ...

Power Digit Sum: What is the sum of the digits of the number 2^1

  • 时间：2020-09-10 12:45:51
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215 = 32768 and the sum of its digits is 3 + 2 + 7 + 6 + 8 = 26. What is the sum of the digits of the number 21000? You probably can compute the direct value of 2^1000. For example, in Python, you can obtain value of (2**1000) and convert... ...

Compute the Maximum Integer Right Triangles Solutions

  • 时间：2020-09-10 12:45:51
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If p is the perimeter of a right angle triangle with integral length sides, {a,b,c}, there are exactly three solutions for p = 120. {20,48,52}, {24,45,51}, {30,40,50} For which value of p ≤ 1000, is the number of solutions maximised? Maxi... ...

Compute Factorial Digit Sum: Find the sum of the digits in the n

  • 时间：2020-09-10 12:45:51
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n! means n × (n − 1) × … × 3 × 2 × 1 For example, 10! = 10 × 9 × … × 3 × 2 × 1 = 3628800, and the sum of the digits in the number 10! is 3 + 6 + 2 + 8 + 8 + 0 + 0 = 27. Find the sum of the digits in the number 100! Algorithm t... ...

How many different ways can £2 be made using any number of coins

  • 时间：2020-09-10 12:45:51
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In the United Kingdom the currency is made up of pound (£) and pence (p). There are eight coins in general circulation: 1p, 2p, 5p, 10p, 20p, 50p, £1 (100p), and £2 (200p). It is possible to make £2 in the following way: 1×£1 + 1×50p + 2×2... ...

Smallest Multiple Algorithm using Bruteforce or GCD/LCM

  • 时间：2020-09-10 12:45:51
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2520 is the smallest number that can be divided by each of the numbers from 1 to 10 without any remainder. What is the smallest positive number that is evenly divisible by all of the numbers from 1 to 20? Bruteforce Algorithm to Find the ... ...

Dynamic Programming Algorithm to Compute the Block Sum in a Matr

  • 时间：2020-09-10 12:45:51
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Given a m * n matrix mat and an integer K, return a matrix answer where each answer[i][j] is the sum of all elements mat[r][c] for i – K <= r <= i + K, j – K <= c <= j + K, and (r, c) is a valid position in the matr... ...

How to Construct Binary Search Tree from Preorder Traversal in P

  • 时间：2020-09-10 12:45:51
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Return the root node of a binary search tree that matches the given preorder traversal. (Recall that a binary search tree is a binary tree where for every node, any descendant of node.left has a value < node.val, and any descendant of nod... ...

Top 10 Relationship Blogs With the Best Pieces of Advice in 2020

  • 时间：2020-09-10 12:41:11
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Are you in for a year full of great dates and new experiences? Looking to start a relationship blog or spruce up your existing one?In this post, we’ve gathered our top 10 picks of the best relationship blogs on the internet to help you spic... ...

How to Protect Your WordPress Site From Hackers

  • 时间：2020-09-10 12:41:11
  • 分类：网络文摘
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Whether you’re maintaining a personal blog, putting together a portfolio, or building a business website, security is paramount. As a platform, WordPress is hit more than almost any other by cybercriminals. Don’t worry, though. Securing yo... ...