dsa1 min read
Minimum Speed to Arrive on Time — BS on Train Speed
Find the minimum train speed to arrive on time given n rides (last ride doesn't wait) using binary search on speed.
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dsa4 min read
Binary Search Master Recap — All Patterns & Templates
Complete cheatsheet for Binary Search: all 7 patterns, the universal template, BS on answer guide, Big O reference, and MAANG priority.
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dsa5 min read
Bit Manipulation — Complete Guide
Master bit manipulation: XOR tricks, counting bits, bitmask DP, Brian Kernighan, two's complement, and 5-language operators.
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Single Number — XOR Cancellation
Every element appears twice except one. XOR all numbers: duplicates cancel (a^a=0), single number remains.
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Single Number II — 3-State Bit Counting
Every element appears 3 times except one. Track bit counts mod 3: ones and twos bitmasks, or count each bit position.
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