< >
{ }
( )
=>
#
::
[ ]
++
Training Arena

CODING CHALLENGES.

Build algorithmic muscle and practice standard interview patterns entirely inside your browser.

All ProblemsDaily Challenge
Daily Challenge
Medium
Array
Google Amazon Meta
Rotates in
10:39:36
Solve Challenge
Status
Title
Category
Difficulty
Two sum
GoogleAmazon+5 more
Array
Easy
Best time to buy and sell stock
AmazonMicrosoft+4 more
Array
Easy
Contains duplicate
AmazonGoogle+4 more
Array
Easy
Move zeroes
MicrosoftMeta+3 more
Array
Easy
Missing number
AmazonMicrosoft+3 more
Array
Easy
Single number
AmazonMicrosoft+3 more
Array
Easy
Max consecutive ones
MicrosoftAmazon+2 more
Array
Easy
Intersection of two arrays ii
GoogleAmazon+2 more
Array
Easy
Third maximum number
AmazonMicrosoft+1 more
Array
Easy
Pascal's triangle
GoogleAmazon+3 more
Array
Easy
Merge sorted array
GoogleAmazon+4 more
Array
Easy
Remove duplicates from sorted array
MicrosoftAmazon+3 more
Array
Easy
Find all numbers disappeared in array
MicrosoftAmazon+2 more
Array
Easy
Squares of a sorted array
GoogleAmazon+2 more
Array
Easy
Sort colors (dutch national flag)
MicrosoftAmazon+3 more
Array
Easy
Showing 1 - 15 of 200 problems
...