Article Categories
- All Categories
-
Data Structure
-
Networking
-
RDBMS
-
Operating System
-
Java
-
MS Excel
-
iOS
-
HTML
-
CSS
-
Android
-
Python
-
C Programming
-
C++
-
C#
-
MongoDB
-
MySQL
-
Javascript
-
PHP
-
Economics & Finance
Programming Articles
Page 567 of 2547
Maximum Nesting Depth of Two Valid Parentheses Strings in Python
A Valid Parentheses String (VPS) consists only of "(" and ")" characters and satisfies specific structural properties. The goal is to split a VPS into two disjoint subsequences A and B such that the maximum nesting depth is minimized. Understanding Valid Parentheses Strings A string is a Valid Parentheses String if ? It is the empty string, or It can be written as AB, where A and B are VPS's, or It can be written as (A), where A is a VPS. Nesting Depth Definition The nesting depth of a VPS is defined ...
Read MoreDelete Nodes And Return Forest in Python
When working with binary trees, we sometimes need to delete specific nodes and return the remaining forest of trees. This problem requires us to remove nodes with values in a given list and return the roots of all remaining subtrees. Problem Understanding Given a binary tree and a list of values to delete, we need to ? Remove all nodes with values in the to_delete list Return the roots of all remaining subtrees (the forest) When a node is deleted, its children become new roots if they exist ...
Read MoreFilling Bookcase Shelves in Python
The bookshelf filling problem involves arranging books with given thickness and height onto shelves of limited width while maintaining their original order. We need to find the minimum possible total height of the bookcase. Each book has dimensions books[i][0] (thickness) and books[i][1] (height). Books must be placed in the given order, and each shelf has a maximum width of shelf_width. 1, 1 2, 3 2, 3 ...
Read MorePath With Maximum Minimum Value in Python
In this problem, we need to find the maximum possible minimum value along any path from the top-left corner [0, 0] to the bottom-right corner [R-1, C-1] of a matrix. A path can move in four cardinal directions (north, east, west, south), and the score is determined by the smallest value encountered along that path. For example, if we have a path 8 → 4 → 5 → 9, the path's score would be 4 (the minimum value). Problem Example Consider this matrix ? 5 4 5 1 2 6 ...
Read MoreSmallest Subsequence of Distinct Characters in Python
Finding the lexicographically smallest subsequence of distinct characters is a classic problem that can be solved using a greedy approach with a stack. Given a string, we need to find the smallest subsequence that contains all unique characters exactly once. For example, if the input is "cdadabcc", the output should be "adbc". Algorithm Overview The approach uses a stack to build the result and two dictionaries to track character positions and inclusion status ? last_occurrence: Stores the last position of each character in_stack: Tracks whether a character is already in the result stack stack: Builds ...
Read MoreInsufficient Nodes in Root to Leaf Paths in Python
When working with binary trees, we sometimes need to remove nodes based on path sum criteria. A node is insufficient if every root-to-leaf path passing through that node has a sum strictly less than a given limit. This problem requires us to delete all insufficient nodes simultaneously and return the modified tree. Problem Understanding Given a binary tree and a limit value, we need to identify and remove nodes where all paths from root to leaf through that node have sums less than the limit. The key insight is that we work backwards from leaves, checking if any ...
Read MoreGrumpy Bookstore Owner in Python
The Grumpy Bookstore Owner problem is a classic sliding window optimization challenge. A bookstore owner can use a technique to stay calm for X consecutive minutes, and we need to find the maximum number of happy customers by choosing the optimal window. Problem Understanding Given three inputs ? customers[i] − number of customers in minute i grumpy[i] − 1 if owner is grumpy, 0 if calm X − technique duration (consecutive minutes) When grumpy, customers are unhappy. We can use the technique once to make the owner calm for X minutes. Find the maximum ...
Read MoreCapacity To Ship Packages Within D Days in Python
The Capacity to Ship Packages Within D Days problem asks us to find the minimum ship capacity needed to transport all packages within a given number of days. Given an array of package weights and D days, we need to determine the least weight capacity that allows shipping all packages sequentially. Problem Understanding For example, with weights [3, 2, 2, 4, 1, 4] and D = 3 days, the minimum capacity is 6 ? Day 1: 3, 2 (total weight: 5) Day 2: 2, 4 (total weight: 6) Day 3: 1, 4 (total weight: 5) ...
Read MoreConstruct Binary Search Tree from Preorder Traversal in Python
A Binary Search Tree (BST) can be constructed from its preorder traversal using a stack-based approach. In preorder traversal, we visit the root first, then the left subtree, followed by the right subtree. 8 5 10 1 7 12 ...
Read MoreSmallest String Starting From Leaf in Python
Suppose we have the root of a binary tree, where each node contains a value from 0 to 25, representing the letters 'a' to 'z': a value of 0 represents 'a', a value of 1 represents 'b', and so on. We have to find the lexicographically smallest string that starts at a leaf of this tree and ends at the root. z(25) b(1) d(3) b(1) ...
Read More