Recursion & Backtracking Challenge
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UNIQUE CODING CHALLENGE

#T20DSAChallenge is a ⚡ 7-day learning + coding sprint on a key DSA topic. Everyday we unlock a set of 🔒 concept video + coding problem – just watch the video to learn the concept, and then tackle the challenge!

Day 1: Minimum Operations to Reduce X to ZeroProblem
Difficulty: EasySubmissions: 3357
Day 2: Three Part Harmony
Prefix Sum
Problem
Difficulty: MediumSubmissions: 1558
Day 3: Parallel Dilemma
GreedyPrefix SumRecursion + Precomputation
Problem
Difficulty: EasySubmissions: 4695
Day 4: Sub Rectangle Sum 🍫
Prefix SumBinary Search
Problem
Difficulty: HardSubmissions: 1000
Afraid of the Dark
Prefix Sum
Problem
Difficulty: EasySubmissions: 402
Day 6: GCD Exclusion
GcdPrefix SumNumber theory
Problem
Difficulty: EasySubmissions: 385
Day 7: Maximum Diamond Sum 🍫
Prefix Sum
Problem
Difficulty: MediumSubmissions: 2502
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Bonus: The Beauty and the Distance
GreedyPrefix Sum
Crown Problem
Difficulty: HardSubmissions: 888