Kata

A personal problem archive — algorithms, single-cell biology, research design, one problem at a time.

Problems

#	Title	Category	Description	Solution	Added
1	Two Sum	algorithm	Given an array of integers and a target find two numbers that add up to the target	solution	2026-04-14
2	Best Time to Buy and Sell Stock	algorithm	Given daily stock prices find the maximum profit from one buy and one sell	solution	2026-04-16
3	Binary Search	algorithm	Given a sorted array and a target find the target index or return -1	solution	2026-04-17

Not every problem has an obvious answer — and that’s the point. Each one is a small mystery waiting to be solved, one clue at a time. The archive grows slowly, but so does the intuition behind it. No rush. Sherlock didn’t solve cases in a day either.