Practice & Master

3,500+ Coding Problems • All Skill Levels

Loading...

Problem Categories

Master every topic, one problem at a time

Organized by data structures and algorithms. Track your progress in each category.

Learning Paths

15 Technology Domains to Master

Explore comprehensive learning paths across all major technology domains. From Programming to AI, Web Development to Blockchain - start your journey today.

Programming & Software Development

Web Development

Mobile App Development

Databases & Data Engineering

Artificial Intelligence & Machine Learning

Data Science & Analytics

Cloud Computing

Cybersecurity

DevOps & System Administration

Blockchain & Web3

Internet of Things (IoT)

Emerging Technologies

Design & User Experience

Business, Product & Startup Tech

Tools, Frameworks & Ecosystem

Programming & Software Development

Web Development

Mobile App Development

Databases & Data Engineering

Artificial Intelligence & Machine Learning

Data Science & Analytics

Cloud Computing

Cybersecurity

DevOps & System Administration

Blockchain & Web3

Internet of Things (IoT)

Emerging Technologies

Design & User Experience

Business, Product & Startup Tech

Tools, Frameworks & Ecosystem

Explore All Learning Paths →

Choose your domain and start learning with structured lessons

Loading company problems...
Loading weekly challenges...

Performance Metrics

Track your coding efficiency and improvement

Detailed analytics to help you understand your strengths and areas for improvement.

📊

Code Efficiency

87%
+12% this month

Your code runs faster than 87% of submissions

📊

Memory Usage

92%
+8% this month

Memory optimization better than 92% of coders

📊

Problem Solving Speed

15 min
-3 min this month

Average time to solve medium problems

📊

Code Quality Score

9.2/10
+0.5 this month

Based on readability, maintainability, and best practices

Recent Submissions

Binary Tree Traversal

✓ Accepted
Time:
12 min
Efficiency:
94%
Memory:
89%

Longest Palindrome

✓ Accepted
Time:
18 min
Efficiency:
88%
Memory:
95%

Graph Shortest Path

✓ Accepted
Time:
25 min
Efficiency:
91%
Memory:
87%

Dynamic Programming

✓ Accepted
Time:
32 min
Efficiency:
85%
Memory:
92%

Array Manipulation

✓ Accepted
Time:
10 min
Efficiency:
96%
Memory:
91%

Unsolved Problems

Master coding with curated problems

Click on any problem to start coding and test your solution in real-time

Loading problems...
0
Easy Problems
0
Medium Problems
0
Hard Problems

Trending Challenges

Scroll through our most popular coding problems

#1
Easy

Two Sum

Arrays

Find two numbers that add up to a target

Acceptance Rate48%
Solved by2.4M
Est. Time15 min
Hash TableArrays
#2
Medium

Binary Tree Traversal

Trees

Implement inorder, preorder, and postorder traversal

Acceptance Rate52%
Solved by1.8M
Est. Time30 min
TreeDFSRecursion
#3
Hard

Dynamic Programming - Knapsack

DP

Solve the classic 0/1 knapsack problem

Acceptance Rate35%
Solved by450K
Est. Time45 min
Dynamic ProgrammingOptimization
#4
Medium

Graph Shortest Path

Graphs

Find shortest path using Dijkstra's algorithm

Acceptance Rate42%
Solved by980K
Est. Time40 min
GraphBFSDijkstra
#5
Easy

String Pattern Matching

Strings

Implement KMP pattern matching algorithm

Acceptance Rate67%
Solved by3.2M
Est. Time20 min
StringPattern Matching
#6
Easy

Linked List Cycle

Linked Lists

Detect if a linked list has a cycle

Acceptance Rate45%
Solved by1.9M
Est. Time20 min
Linked ListTwo Pointers
#7
Medium

Merge Sort

Sorting

Implement the merge sort algorithm

Acceptance Rate58%
Solved by1.2M
Est. Time35 min
SortingDivide & Conquer
#8
Medium

Depth First Search

Graphs

Traverse a graph using DFS

Acceptance Rate49%
Solved by890K
Est. Time30 min
GraphDFSRecursion
#9
Easy

Two Sum

Arrays

Find two numbers that add up to a target

Acceptance Rate48%
Solved by2.4M
Est. Time15 min
Hash TableArrays
#10
Medium

Binary Tree Traversal

Trees

Implement inorder, preorder, and postorder traversal

Acceptance Rate52%
Solved by1.8M
Est. Time30 min
TreeDFSRecursion
#11
Hard

Dynamic Programming - Knapsack

DP

Solve the classic 0/1 knapsack problem

Acceptance Rate35%
Solved by450K
Est. Time45 min
Dynamic ProgrammingOptimization
#12
Medium

Graph Shortest Path

Graphs

Find shortest path using Dijkstra's algorithm

Acceptance Rate42%
Solved by980K
Est. Time40 min
GraphBFSDijkstra
#13
Easy

String Pattern Matching

Strings

Implement KMP pattern matching algorithm

Acceptance Rate67%
Solved by3.2M
Est. Time20 min
StringPattern Matching
#14
Easy

Linked List Cycle

Linked Lists

Detect if a linked list has a cycle

Acceptance Rate45%
Solved by1.9M
Est. Time20 min
Linked ListTwo Pointers
#15
Medium

Merge Sort

Sorting

Implement the merge sort algorithm

Acceptance Rate58%
Solved by1.2M
Est. Time35 min
SortingDivide & Conquer
#16
Medium

Depth First Search

Graphs

Traverse a graph using DFS

Acceptance Rate49%
Solved by890K
Est. Time30 min
GraphDFSRecursion

← Scroll horizontally to see more challenges →

Ready to Battle?

Join thousands of developers already competing on CoderspaE

© 2024 CoderspaE. All rights reserved.

Made with ❤️ by developers, for developers