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DSA Problems
4 unsolved in your plan today
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Easy
Medium
Hard
E
Two Sum Easy
Arrays & Hashing
Find two numbers that add up to target
M
LRU Cache Medium
Design
Implement a Least Recently Used cache
H
Median of Streams Hard
Heaps
Find median from a data stream
M
Word Break Medium
Dynamic Programming
Segment string using a dictionary
E
Valid Parentheses Easy
Stack
Check if brackets are balanced
Two Sum — Submission #48
Passed 2/3 12ms · 9.4MB
T
Wrong Answer on Hidden Case - 3. Your current solution handles positive numbers but misses negative integer edge cases. Try tracing through nums = [-2, -1, 0], target = -1.
U
Oh I see — I didn't account for negative numbers. Should I use a HashMap approach instead?
T
Exactly! A HashMap (complement → index) approach handles all integer values in O(n) time.
TUFY AI Suggestion
Use a HashMap to store complement of each element. Check if current element exists as a key before inserting.
Your Stats
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🔥 23 Days
Problems Solved
284 / 600
Today's Goal
3 of 5 done
Topic Mastery
Arrays · Trees · DP
85
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pipeline.yml - Deploy #402
✓ Running unit tests (842/842 passed)
✓ Static analysis: 0 critical issues
✓ Memory leak scan complete
✓ Performance budget check

⟳ Deploying to production environment...
Code Editor - main.js
EXPLORER
> src/components
> src/hooks
v src/utils
main.js
import { useState } from 'react';

export function App() {
  const [state, setState] = useState(0);
  return (
    <div>Hello World</div>
  );
}
Execution Analytics
Latency: 12ms 📉
Validation Issues (3)

Memory Leak Detected

useCallback hook dependency array missing.

Missing Type Definitions

Props in Header component are implicitly any.

Unused Import

React is defined but never used in Layout.js.

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