happy_finch_2584
Exemplar
Top 2.6%
Joined Sep 2026
SQL
Common Table Expressions
Scalar Subquery
Sums & Averages
Python
Generators
Two-Pointer
List Comprehension
Spark
Catalyst Optimizer
Salting Strategy
Adaptive Query Execution
Data Modeling
Metric Additivity
Entities
Learned
Python158
SQL7
Milestones
Milestones unlock as you keep learning.
494 runs in the past 26 weeksActive days: 6 · Max streak: 5
MayJunJulAugSepOct
Recent solves
Complexity: Beginner
Python · medium · lesson
Complexity: Beginner
Python · medium · lesson
Complexity: Beginner
Python · medium · lesson
Complexity: Beginner, O(n²) -- Quadratic Time Challenge 1
Python · easy · lesson
Complexity: Beginner, O(n) -- Linear Time Challenge 2
Python · easy · lesson
Complexity: Beginner, O(n) -- Linear Time Challenge 1
Python · easy · lesson
Complexity: Beginner, O(1) -- Constant Time Challenge 2
Python · easy · lesson
Complexity: Beginner, O(1) -- Constant Time Challenge 1
Python · easy · lesson
Complexity: Beginner, Why Speed Matters Challenge 1
Python · easy · lesson
Problem Solving: Advanced
Python · medium · lesson