Sum of Multiples of 3 and 5

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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If we list all the natural numbers below 10 that are multiples of 3 or 5, we get 3, 5, 6 and 9. The sum of these multiples is 23. Find the sum of all the multiples of 3 or 5 below 1000. Let’s declare a Javascript function to sum up ... ...

Sum of Even Fibonacci Numbers

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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Each new term in the Fibonacci sequence is generated by adding the previous two terms. By starting with 1 and 2, the first 10 terms will be: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, … By considering the terms in the Fibonacci sequence whos... ...

Can we Construct K Palindrome Strings?

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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Given a string s and an integer k. You should construct k non-empty palindrome strings using all the characters in s. Return True if you can use all the characters in s to construct k palindrome strings or False otherwise. Example 1: Input... ...

What is the largest prime factor of the number 600851475143 ?

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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The prime factors of 13195 are 5, 7, 13 and 29. What is the largest prime factor of the number 600851475143 ? We can start prime number 2 and keep dividing the Number until it can’t, then move to next prime number. Repeat this proce... ...

Find the largest palindrome From the product of two 3-digit numb

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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A palindromic number reads the same both ways. The largest palindrome made from the product of two 2-digit numbers is 9009 = 91 × 99. Find the largest palindrome made from the product of two 3-digit numbers. To check if a number in Javasc... ...

Recursive Depth First Search Algorithm to Compute the Diameter o

  • 时间：2020-09-10 12:55:33
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Given a binary tree, you need to compute the length of the diameter of the tree. The diameter of a binary tree is the length of the longest path between any two nodes in a tree. This path may or may not pass through the root. Example: Give... ...

Number of Steps to Reduce a Number in Binary Representation to O

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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Given a number s in their binary representation. Return the number of steps to reduce it to 1 under the following rules: If the current number is even, you have to divide it by 2. If the current number is odd, you have to add 1 to it. It&#... ...

The Difference Between Sum of Squares and Square of the Sum

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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The sum of the squares of the first ten natural numbers is, 1^2+2^2+3^2+…10^2=385 The square of the sum of the first ten natural numbers is, (1+2+…+10)^2=55^2=3025 Hence the difference between the sum of the squares of the firs... ...

Find the 10001st Prime Number

  • 时间：2020-09-10 12:55:33
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By listing the first six prime numbers: 2, 3, 5, 7, 11, and 13, we can see that the 6th prime is 13. What is the 10001st prime number? Test Prime Number A prime number has exactly two factors: 1 and itself. Thus we can write a quick prime... ...

How Many Squares/Rectangles Does a Rubik Cube Have?

  • 时间：2020-09-10 12:55:33
  • 分类：网络文摘
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A Rubik cube usually have 6 sides. Take 3×3 rubik cube for example, each side has 9 little squares (1×1), 4 medium squares (2×2) and 1 big square (3×3). Therefore, there are 6 x (9 + 4 + 1) = 84 squares on a 3×3 rub... ...