← TechAlgorithmic Archive · C++

LeetCode

Mathematical formulations, visual state-space reductions, and step-by-step C++ implementations of algorithmic problems.

Solved Writeups
2
Primary Language
C++20
Methodology
Math + Visual + Code
ProblemComplexity · Language
#0001

Two Sum

Easy
Time: O(n)Space: O(n)C++

Algebraic reduction from an O(n²) upper-triangular Cartesian search to an O(n) single-pass inverse hash table lookup.

#Array#Hash Table
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#0002

Add Two Numbers

Medium
Time: O(max(m, n))Space: O(1) auxC++

Linear lockstep traversal over base-10 digit sequences in reverse order with inductive carry propagation and sentinel node allocation.

#Linked List#Math#Recursion
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