Solving the Single Number problem in Python
The challenge
Given a non-empty array of integers, every element appears twice except for one. Find that single one.
Note:
Your algorithm should have …
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In-depth guides, insights, and best practices for modern software engineering
Rotate a Matrix List in Python
The challenge
You are given an n x n 2D matrix representing an image.
Rotate the image by 90 degrees (clockwise).
Note:
You have to rotate the image …
Read Article →Check if Valid Sudoku Blocks in Java
The challenge of solving valid Sudoku blocks
Determine if a 9×9 Sudoku board is valid. Only the filled cells need to be validated according to the …
Read Article →Find the Intersection of Two Arrays in Python
The challenge
Given two arrays, write a function to compute their intersection.
Example 1:
Example 2:
Note:
- Each element in the result should …
Rotate an Array K Times in Python
The challenge
Given an array, rotate the array to the right by k steps, where k is non-negative.
Example 1:
Example 2:
Constraints:
1 <= …
FizzBuzz in Java
The challenge
Write a program that outputs the string representation of numbers from 1 to n.
But for multiples of three it should output “Fizz” …
Read Article →Python Splices reimplemented in Java
Python has a fantastic feature called slices. It allows you to work with a list, set or string by it’s index items.
E.g.:
string_sample = …Solving Two Sum in Python
The challenge
Given an array of integers, return indices of the two numbers such that they add up to a specific target.
You may assume that each input …
Read Article →Get the Next Small Integer in Python
The challenge
Write a function:
def solution(A)
that, given an array A of N integers, returns the smallest positive integer (greater than 0) that does …
Read Article →Is a Valid Palindrome with Java
The challenge
Given a string, determine if it is a palindrome, considering only alphanumeric characters and ignoring cases.
Note: For the purpose of …
Read Article →Is a Valid Anagram with Java
The challenge
Given two strings s and t , write a function to determine if t is an anagram of s.
Example 1:
Example 2:
Note:
You may assume the …
How to ReImplement strStr() in Java
What we want to achieve
Return the index of the first occurrence of needle in haystack, or -1 if needle is not part of haystack.
Example 1:
Example …
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