Coding Challenges

Practice real problems and run your code directly in the browser.

30 problems
01.Power of Two
math
easy
02.Multiplication Table
loops
easy
03.FizzBuzz
loops
easy
04.Prefix Sums
arrays
easy
05.Count Occurrences
arrays
easy
06.Find Minimum and Maximum
arrays
easy
07.Count Vowels
strings
easy
08.Palindrome Check
strings
easy
09.Reverse a String
strings
easy
10.Prime Check
math
easy
11.Factorial
math
easy
12.Sum of Digits
math
easy
13.Group Anagrams Count
stringshash map
medium
14.Frequency Map
hash maparrays
medium
15.Find Peak Element
binary searcharrays
medium
16.Search in Rotated Sorted Array
binary searcharrays
medium
17.Meeting Rooms
sortingarrays
medium
18.Merge Intervals
sortingarrays
medium
19.Anagram Check
stringshash map
medium
20.First Unique Character
stringshash map
medium
21.Longest Palindromic Substring Length
stringsdynamic programming
medium
22.Sliding Window Maximum
arrays
medium
23.Maximum Subarray Sum
arraysdynamic programming
medium
24.Two Sum
arrayshash map
medium
25.Generate All Subsets
recursionarrays
hard
26.Container With Most Water
two pointersarrays
hard
27.BFS Shortest Path in Grid
graphsBFS
hard
28.0/1 Knapsack
dynamic programming
hard
29.Longest Common Subsequence
dynamic programmingstrings
hard
30.Coin Change
dynamic programming
hard