PyC++JS
Practise DSA and competitive programming with problems matched to your level, and grow alongside people who solve for fun.
def two_sum(nums, k):
seen = {}
for i, x in enumerate(nums):
if k - x in seen:
return [seen[k - x], i]
Run codePractice built around you,not a fixed problem list
Dynamic Mode reads how you solve and serves the next problem that fits, across DSA and competitive programming.
Trusted by learners solving daily
01 · DSA
Problems
500+ total
- 1Two SumEasy52%
- 20Valid ParenthesesEasy41%
- 56Merge IntervalsMedium47%
- 3Longest SubstringMedium35%
- 139Word BreakMedium46%
- 4Median of Two ArraysHard39%
- 70Climbing StairsEasy53%
- 200Number of IslandsMedium58%
- 207Course ScheduleMedium46%
- 146LRU CacheMedium43%
- 23Merge k Sorted ListsHard52%
- 153SumMedium36%
02 · Community
CodeHurdle
Channels
- announcements
- general
- dsa-help
- weekly-contest
- show-your-work
- interview-prep
- Study room
- Mock interviews
- A
Aarav 10:42
Anyone solved today’s DP one with O(n) memory?
- M
Mei 10:44
Yes, roll the array: only the last row matters.
dp[i % 2][j] - S
Sam 10:45
That cut my runtime in half, thanks.
- R
Riya 10:51
Posted a walkthrough of the two-pointer trick for 3Sum in #show-your-work.
- A
Aarav 10:53
Nice, the dedupe step finally clicked for me.
while l < r: - K
Kenji 10:58
Weekly contest starts in 20 minutes, who is in?
- M
Mei 11:00
Count me in. Warming up with a quick Dynamic Mode set.
- S
Sam 11:02
Same. Anyone want to pair on the graph problem after?
- R
Riya 11:04
I will join the study room, voice on.
Frequently asked questions
Quick answers about how CodeHurdle works. Need more? Ask in the Community.
A place to practise data structures, algorithms and competitive programming, with problems matched to your level and a community of people solving alongside you.
Dynamic Mode watches how you solve and serves the next problem that fits, so you are stretched without being stuck. Each pick shows how well it matches your current level.
DSA Hub holds curated problems and learning paths for building fundamentals. CP Arena is for competitive programming, with timed contests and harder problems.
Python, C++ and JavaScript. Pick a language per problem in the editor and run your code against the sample cases before you submit.
Yes. Your code is saved per problem, so you can leave halfway through and pick up exactly where you stopped.
Join servers and channels built around DSA and competitive programming: ask for help, share solutions, discuss weekly contests and study together in voice rooms.