Practice
30+ curated tasks from easy to hard — loops, strings, arrays, hashing, recursion, sorting, two pointers — with statements in Uzbek, Russian and English.
uz · ru · en
Practice coding. Get hints, not answers.
Solve tasks in Python, JavaScript, C++ or Java, run them against hidden tests in seconds, and ask the AI tutor for a nudge when you're stuck.
solution.pypython3
1n = int(input())2a = list(map(int, input().split()))3best = cur = a[0]4for x in a[1:]:5 cur = max(x, cur + x)6 best = max(best, cur)7print(best)
Judging… Accepted7 / 7 tests38 ms
+25 XP · streak 🔥 4
Hint 2 / 3
30+
tasks with editorials
4
programming languages
3
levels of hints
3
interface languages
Python 3JavaScriptC++JavaMonacoSandbox1v1ELOXPStreaksGeminiuz · ru · enPython 3JavaScriptC++JavaMonacoSandbox1v1ELOXPStreaksGeminiuz · ru · en
Everything a learner needs
From the first loop to a live 1v1 — one place, three languages.
Instant verdicts
Your code runs against hidden tests in an isolated sandbox: Accepted, Wrong answer, Time limit or Runtime error within seconds, with time and memory.
AI tutor
Three levels of hints that nudge you toward the idea: understand the task, find the approach, unblock your code. It never hands over the solution.
1v1 battles
Find an opponent, get the same task, race to the first Accepted. ELO-style ratings, rematches and spectators.
For schools
Teachers create classes, assign tasks, review submissions with comments and watch a class leaderboard.
Progress that shows
XP, levels, daily streaks and achievements. Editorials unlock after you solve a task — learn the intended idea.
How it works
Four steps, a few minutes each.
1
Pick a task
Filter by difficulty and topic. Every statement comes in your language.
2
Write code
Monaco editor in the browser — the same engine as VS Code, with templates for every language.
3
Get a verdict
Hidden tests run in a sandbox. See exactly which case failed and how fast you ran.
4
Learn the idea
Stuck? Ask the tutor. Solved? Read the editorial and compare approaches.
Race a rival to Accepted
Battles are 1v1: the same task, 15 minutes, first Accepted wins. Ratings move ELO-style, and the tutor sits this one out.
- First Accepted wins
- ELO-style rating
- Live battles
- Rematch in one click
Y +16
You
1000 → 1016
VS
R
Rival
1000 → 984
14:32
A tutor that nudges, not solves
Hints unlock in order and are limited per day, so you keep thinking. Every hint is logged and reviewed for quality.
Never hands over the solution
1
Level 1 · Understand
Restates the task and points at what to look for in the input.
2
Level 2 · Approach
Names the idea — a hash map, two pointers, a sieve — without the code.
3
Level 3 · Unblock
Looks at your code and says where it goes wrong. Still no solution.
Built for classrooms
An organization is a school or a course. Teachers see who solved what, students see their assignments.
Classes by invite
Students join with a code or a link; no admin work.
Assignments
Assign tasks to the whole class or to specific students.
Review with comments
Open any submission, leave feedback, the student replies.
Class leaderboard
Solved counts and streaks per class, private to the org.