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Remove Palindromic Subsequences

May 21, 2025 · 5 min · array · leetcode · palindrome · puzzle · sorting · string · subsequence · two-pointers · Last updated: Aug 2, 2025

Lazy Caterer's sequence

February 15, 2025 · 3 min · maths · puzzle · Last updated: Mar 12, 2025

Implement multiplication, subtraction, and division using only addition

February 10, 2024 · 4 min · ctci · puzzle · bits · maths · multiplication · divisor · add · Last updated: Nov 16, 2024

Tower of Hanoi

April 29, 2023 · 7 min · ctci · stack · recursion · puzzle · video · Last updated: Aug 2, 2025

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