💡 Problem Formulation: In Python, it’s a common scenario to have a list of tuples that you may want to flatten or convert into a single sequence of digits. For instance, having ((1,2), (3,), (4,5)) as input and wanting to convert it into 12345 as the output. This article explores various methods to accomplish this … Read more
💡 Problem Formulation: We need to determine the largest rectangular area that can be inscribed in a given histogram. A histogram is a graph representing the frequency distribution of data, and we are particularly examining the largest rectangle that can fit under the graph. Given an array of bar heights representing the histogram, the desired … Read more
💡 Problem Formulation: When working with data in Python, it’s not uncommon to require the conversion of a list of strings into a list of tuples, where each tuple contains individual elements from the strings. Suppose you have a list [‘123’, ‘456’, ‘789’], and you want the result to be [(1, 2, 3), (4, 5, … Read more
💡 Problem Formulation: How can we determine if a given string or input represents a valid number in Python? A common requirement is to verify whether user input can be converted to a numerical type such as an integer or a float. For example, the input ‘123’ should be recognized as a valid number, whereas … Read more
💡 Problem Formulation: In Python, developers often need to convert a mixed list containing both strings and individual characters into a flat list of individual characters. For example, if our input is [‘apple’, ‘b’, ‘cat’], we want our output to be [‘a’, ‘p’, ‘p’, ‘l’, ‘e’, ‘b’, ‘c’, ‘a’, ‘t’]. This article demonstrates multiple methods … Read more
💡 Problem Formulation: Jump Game II is a classic programming challenge where given an array of non-negative integers, each element represents your maximum jump length from that position. The goal is to reach the last index in the minimum number of jumps. For instance, given the input [2,3,1,1,4], the minimum number of jumps to reach … Read more
💡 Problem Formulation: Wildcard matching is commonly used in search operations where you want to match strings with patterns containing wildcard characters. For instance, if you want “*.txt” to match any files that end with “.txt“, the wildcard “*” stands for any sequence of characters. This article demonstrates how to accomplish wildcard matching in Python, … Read more
💡 Problem Formulation: The ‘trapping rain water’ problem involves calculating the total amount of rainwater that can be trapped within a given set of non-negative integer arrays, which represent elevation maps. Each element in the array corresponds to the elevation at that position. For example, given the input array [0,1,0,2,1,0,1,3,2,1,2,1], the desired output is 6 … Read more
💡 Problem Formulation: The problem is to identify the smallest positive integer that does not appear in a given sequence of numbers. For instance, given an input [3, 4, -1, 1], the desired output is 2, because it is the smallest positive integer missing from the list. Method 1: Sorting and Linear Scan This method … Read more
💡 Problem Formulation: Given a string containing just the characters ‘(‘ and ‘)‘, the goal is to find the length of the longest well-formed (valid) parentheses substring. For example, given the input ‘()()‘, the desired output is ‘4‘, whereas for ‘(())‘, the output should also be ‘4‘. Method 1: Stack-Based Approach The Stack-Based Approach involves … Read more
💡 Problem Formulation: Imagine you have multiple sorted lists, and your goal is to combine them into a single sorted list. For example, if your input is [[10, 20], [30], [40, 50, 60]], the desired output would be [10, 20, 30, 40, 50, 60]. This article walks through different methods to achieve that in Python. … Read more
💡 Problem Formulation: Regular expressions are a powerful tool for pattern matching and text manipulation. In Python, they are widely used for parsing strings, checking for the presence of specific patterns, and extracting substrates. This article discusses how to perform regular expression matching in Python, with an example input of “example.email+json@gmail.com” and the desired output … Read more