Showing 32 posts tagged with "leetcode"
2206. Divide Array Into Equal Pairs
An in-depth algorithmic guide to LeetCode 2206: Divide Array Into Equal Pairs, covering parity invariants, O(N) linear time, and C++ & TypeScript code.
Apple Technical Interview Retrospective: Search a 2D Matrix & Container With Most Water
Retrospective of a 6-round technical interview loop with Apple through Mphasis: Detailed solutions and asymptotic analysis for LeetCode 74 (Search a 2D Matrix) and LeetCode 11 (Container With Most Water).
C++ Solution for LeetCode 2594: Minimum Time to Repair Cars with Binary Search on Answer
Master LeetCode 2594 Minimum Time to Repair Cars in C++20 using binary search on monotonic answers and rank frequency map optimization.
2529. Maximum Count of Positive Integer and Negative Integer
An in-depth algorithmic guide to LeetCode 2529: Maximum Count of Positive Integer and Negative Integer, featuring binary search boundaries and TypeScript code.
Parenthesis Checker: Stack Algorithms, AST Tokenization & Balanced Syntax
Comprehensive guide to the Parenthesis Checker algorithm: LIFO stack mechanics, compiler AST tokenization, edge-case optimization, and TypeScript/C++ code.
LeetCode 2375: Construct Smallest Number From DI String — Monotonic Stack & Two-Pointer Analysis
Algorithmic deep dive on LeetCode 2375 (Construct Smallest Number From DI String): monotonic stack greedy digit reversal, step-by-step trace of IIIDIDDD, and C++20 / TypeScript solutions.
Generating Subsets via Backtracking: LeetCode 1863 XOR Totals & Mathematical O(n) Proof
Algorithmic masterclass on LeetCode 1863 (Sum of All Subset XOR Totals): backtracking state-space trees vs optimal O(n) bitwise OR mathematical proof with C++20, TypeScript, and Python 3 implementations.
Finding the K Largest Elements: Sorting vs. Min-Heap Priority Queues vs. Quickselect
Comprehensive algorithmic guide to finding the K largest elements in an array: full sorting, O(N log K) min-heap priority queue, and O(N) Quickselect.
1079. Letter Tile Possibilities
A comprehensive algorithmic analysis of LeetCode 1079: Letter Tile Possibilities, featuring frequency-map DFS, stack-allocated arrays, and C++ & TypeScript code.
LeetCode 1718: Constructing the Lexicographically Largest Distanced Sequence via Greedy Backtracking
Comprehensive algorithmic guide to LeetCode 1718: greedy backtracking, distanced sequence invariants, early exit optimizations, and C++/TypeScript implementations.
3174. Clear Digits
An in-depth algorithmic guide to LeetCode 3174: Clear Digits, covering LIFO stack mechanics, in-place two-pointer compaction, and C++ & TypeScript code.
In-Order Binary Tree Traversal: Recursive, Iterative Stack & O(1) Space Morris Traversal
Comprehensive algorithmic guide to binary tree in-order traversal: recursive call stack limits, iterative heap stacks, and O(1) space Morris traversal.
LeetCode 3160: Find the Number of Distinct Colors Among the Balls (Dual Hash Map State Machine)
Optimal algorithmic solution for LeetCode 3160: Find the Number of Distinct Colors Among the Balls using a Dual Hash Map State Machine in O(N) time and O(N) space.
LeetCode 1726: Tuple with Same Product — Hash Map Combinatorics & O(n²) Optimization
LeetCode 1726 Tuple with Same Product solution: O(n²) pairwise product hash map, mathematical proof of 8x permutation multiplier, C++20 and TypeScript.
1790. Check if One String Swap Can Make Strings Equal
An in-depth algorithmic guide to LeetCode 1790: Check if One String Swap Can Make Strings Equal, covering mismatch invariants, O(1) space, and C++ & TypeScript code.
Remove Nth Node From End of List: Two-Pointer Fast & Slow Runner Mechanics
Algorithmic guide to removing the Nth node from end of a linked list: single-pass two-pointer runner technique, dummy sentinel nodes, and C++/TypeScript code.
Subarray Sum Equals K: Prefix Sum State Machine, Negative Numbers & Hash Map Frequency Analysis
Complete guide to solving LeetCode 560 Subarray Sum Equals K: Why sliding windows fail on negative numbers, Prefix Sum + Hash Map state machine, C++20 and TypeScript.
1678. Goal Parser Interpretation
A comprehensive guide to LeetCode 1678: Goal Parser Interpretation, covering LL(1) grammars, deterministic single-pass parsing, and V8 string performance.
2559. Count Vowel Strings in Ranges
An in-depth algorithmic guide to LeetCode 2559: Count Vowel Strings in Ranges, covering prefix sum arrays, O(1) range queries, and C++ & TypeScript code.
1030. Matrix Cells in Distance Order
A comprehensive algorithmic guide to LeetCode 1030: Matrix Cells in Distance Order, covering Manhattan distance math, BFS, Bucket Sort, and TypeScript implementations.
LeetCode 1422: Maximum Score After Splitting a String (O(N) Prefix Balance)
Master LeetCode 1422 (Maximum Score After Splitting a String): single-pass O(N) algebraic reduction, prefix balance tracking, and O(1) space proofs.
Why 90% of CS Graduates Struggle with Level-Order Tree Traversal
A deep dive into level-order tree traversal: why candidates struggle, modern C++ std::queue implementations, Boost ptree vs Graph analysis, and TypeScript code.
LeetCode 2466: Count Ways To Build Good Strings — Tabulation DP vs Memoized DFS & Combinatorics
Comprehensive algorithmic guide for LeetCode 2466 (Count Ways To Build Good Strings): tabulation dynamic programming vs memoized DFS, modulo 10^9+7 arithmetic, and C++20 / TypeScript code.
Set Matrix Zeroes: Optimal O(1) Space In-Place Algorithm, Boundary Markers & Cache Locality
Comprehensive guide to solving LeetCode 73 Set Matrix Zeroes in-place with O(1) auxiliary space, resolving (0,0) marker collisions, cache locality, and C++/TypeScript code.
Search a 2D Matrix: Optimal Binary Search, Staircase Elimination & Memory Locality
Algorithmic guide to searching 2D sorted matrices: virtual 1D binary search, top-right staircase elimination, cache line locality, and C++/TypeScript code.
LeetCode 543: Diameter of a Binary Tree in C++ & Post-Order DFS
Master LeetCode 543 (Diameter of a Binary Tree) in C++: post-order DFS height calculation, eliminating O(N^2) redundancy, and call stack analysis.
401. Binary Watch
An in-depth algorithmic guide to LeetCode 401: Binary Watch, featuring Cartesian search, bit manipulation, and C++ & TypeScript code.
Letter Combinations of a Phone Number: Combinatorial Backtracking & T9 Algorithms
Master LeetCode 17 (Letter Combinations of a Phone Number): combinatorial backtracking DFS, BFS queue generation, O(3^N * 4^M) complexity, and T9 systems.
LeetCode 20: Valid Parentheses in TypeScript & V8 Stack Mechanics
Master LeetCode 20 (Valid Parentheses) in TypeScript: LIFO stack mechanics, V8 array internals, early exit branch pruning, and O(N) complexity proofs.
C++ Solution for Generate Parentheses (LeetCode #22): Backtracking & Catalan Numbers
Master LeetCode #22 Generate Parentheses in C++20 with backtracking pruning invariants, Catalan numbers combinatorics, and memory buffer optimization.
Minimum Characters to Add for Palindrome: Algorithms & Solutions
A complete algorithmic guide to solving the Minimum Characters to Add for Palindrome problem in O(N) linear time using KMP LPS preprocessing.
Find Peak Element: Logarithmic Binary Search Algorithm, Proof & Multi-Language Guide
Master the Find Peak Element algorithm (LeetCode 162) in O(log n) logarithmic time. Mathematical convergence proof on unsorted arrays with C++20, TypeScript, and Python 3 implementations.