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300+ questions · full roadmap · in-browser compiler · hints · tricks · daily problems — everything to crack any placement test.
300+Questions
14Topics
30+Patterns
8Company Sets
4Languages
Everything you need to master DSA
Not just questions — a complete structured system
🗺️
Structured Roadmap
Step-by-step path from absolute basics to advanced. Follow the sequence, never feel lost. 14 topics in perfect order.
14 topics
💻
In-browser Compiler
Write and run code directly in the browser. No setup needed. Instant output, instant feedback.
Java
Python
C++
C
💡
Hints + Full Solutions
Stuck? Get a nudge first — don't spoil it early. Then see the full solution with line-by-line explanation and approach.
Every question
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30+ Patterns & Tricks
Sliding Window, Two Pointer, Monotonic Stack, Fast-Slow Pointer, DP state identification, Bit tricks and more.
30+ patterns
🏢
Company-wise Sets
TCS, Infosys, Amazon, Wipro, Flipkart, Zoho and more. Practice exactly what each company asks.
8 companies
📅
Daily Problem + Leaderboard
One problem every day. Track your streak. See how many classmates solved it. Compete on the live leaderboard.
Daily streak
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Similar Questions
Every question links to 3-4 related problems. Build pattern recognition, not just one-off solutions.
Every question
🎥
Curated Video Library
Best YouTube videos for each topic — Striver, NeetCode, Abdul Bari. Handpicked, not a random dump.
Topic-wise
The Roadmap
Follow this sequence. Each step builds on the last. No confusion — just progress.
The foundation. 40% of placement tests covered here alone. Start here, always.
Sliding Window
Two Pointer
Prefix Sum
Kadane's
Pointers, reversal, merge, cycle detection. TCS and Infosys love these.
Fast-Slow Pointer
Reversal
Merge
Monotonic stack is underrated. Appears way more than people expect in coding rounds.
Monotonic Stack
BFS Queue
Next Greater
Recursion & Backtracking
24 Q
The mindset shift. Once recursion clicks, Trees and DP become 10x easier.
Base Cases
Permutations
N-Queens
Subsets
Traversals, height, LCA, path problems. Amazon's most favourite topic by far.
DFS/BFS
Level Order
LCA
BST ops
Beyond textbook — merge sort variations, custom comparators, sorting + binary search combos.
Merge Sort
Quick Select
Custom Sort
Not just sorted arrays — Binary search on answer is a game changer technique.
On Answer
Rotated Array
Peak Element
Heaps & Priority Queue
16 Q
Top-K problems, median streams, heap sort. More common than most realize.
Top K
Min/Max Heap
Kth Largest
BFS, DFS, Dijkstra, Topological Sort. Scary until it clicks — then it's beautiful.
Dijkstra
Topo Sort
Union Find
Bipartite
When to be greedy and when not to. Interval scheduling, activity selection, jump game.
Intervals
Activity Selection
Jump Game
The boss level. Memoization → Tabulation → Space optimization. We go deep.
1D DP
2D DP
LCS/LIS
Knapsack
DP on Trees
Tries & Advanced Trees
14 Q
Prefix trees, segment trees, Fenwick trees. Separates good candidates from great ones.
Prefix Tree
Segment Tree
Word Search
XOR tricks, power of 2 checks, bit masking for subsets. Compact but powerful.
XOR Tricks
Bitmask DP
Brian Kernighan
Math & Number Theory
14 Q
GCD, LCM, primes, modular arithmetic. Aptitude + coding round overlap. Easy wins.
Sieve
Mod Arithmetic
Fast Power
🏆
Placement Ready
TCS · Infosys · Amazon · Google · Flipkart
How every question looks
Problem · Hint · Solution · Compiler — all in one view, no tab switching
Medium
Two Sum
Arrays
TCS · Amazon
Similar: Three Sum, Four Sum →
Given an array of integers nums and integer target, return indices of two numbers that add up to target. Each input has exactly one solution.
Input: nums = [2,7,11,15], target = 9
Output: [0, 1]
💡 Use a HashMap — store each number and its index. For each num, check if (target - num) already exists in the map.
Time: O(n) · Space: O(n)
import java.util.*;
class Solution {
public int[] twoSum(int[] nums, int target) {
// Write your solution here
}
}
Output will appear here...
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