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Coding Challenges

Medium

JavaScript

Valid Parentheses

Check if string has valid parentheses configuration

325 XP

60% success rate

~15 min

287 submissions

Hard

JavaScriptAlgorithms

Reverse Linked List

Traverse a binary tree using depth-first search

350 XP

55% success rate

~20 min

324 submissions

Easy

JavaScript

Binary Tree Traversal

Find indices of two numbers that add up to target

375 XP

50% success rate

~25 min

361 submissions

Medium

JavaScriptAlgorithms

Two Sum Problem

Check if string has valid parentheses configuration

400 XP

45% success rate

~30 min

398 submissions

Hard

JavaScript

Valid Parentheses

Traverse a binary tree using depth-first search

425 XP

40% success rate

~35 min

435 submissions

Easy

JavaScriptAlgorithms

Reverse Linked List

Find indices of two numbers that add up to target

450 XP

35% success rate

~40 min

472 submissions