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Articles on Trending Technologies
Technical articles with clear explanations and examples
Python program to sort string in custom order
Sorting strings in a custom order requires defining a special key function. In this problem, we need to sort an alphanumeric string with specific priority rules for different character types. Sorting Rules The custom sorting follows this priority order: All sorted lowercase letters come first All sorted uppercase letters come second All sorted odd digits come third All sorted even digits come last For example, if the input is "HeLlo1234", the output will be "eloHL1324". Custom Key Function We create a key function that assigns priority codes to different character types ? ...
Read MorePython program to sort table based on given attribute index
Suppose we have a 2D list containing information about athletes. This information includes rank, age, and height. Each row contains data for different athletes. We need to sort the table based on a given attribute index k. So, if the input is like ? Rank Age Height 1 25 190 2 35 180 3 33 185 4 26 175 5 35 180 And k = 1 (sort by age), then the output will be ? ...
Read MoreProgram to perform prefix compression from two strings in Python
Suppose we have two strings s and t (both contain lowercase English letters). We need to find a list of three pairs, where each pair is in the form (l, k) where k is a string and l is its length. The three pairs represent: the longest common prefix of both strings, the remaining part of string s, and the remaining part of string t. So, if the input is like s = "science" and t = "school", then the output will be [(2, 'sc'), (5, 'ience'), (4, 'hool')] Algorithm To solve this, we will follow these ...
Read MoreProgram to perform string compression in Python
String compression using run-length encoding replaces consecutive repeated characters with the character followed by its count. For example, 'bbbb' becomes 'b4'. Single characters remain unchanged without a count. So, if the input is like s = "abbbaaaaaaccdaaab", then the output will be "ab3a6c2da3b". Algorithm To solve this, we will follow these steps − Initialize an empty result string and counter set to 1 Iterate through the string starting from index 1 If current character matches previous character, increment counter ...
Read MoreProgram to swap string characters pairwise in Python
Swapping string characters pairwise means exchanging adjacent characters at positions (0, 1), (2, 3), (4, 5), and so on. This is useful for simple text transformations and encoding operations. Problem Statement Given a string, swap all odd positioned elements with even positioned elements to create a pairwise swapped permutation. For example, if the input is s = "programming", the output will be "rpgoarmmnig". Algorithm To solve this problem, we follow these steps − Convert the string to a list of characters Iterate through the string ...
Read MorePython program to define class for complex number objects
Complex numbers are mathematical objects with real and imaginary parts, typically written as a + bi. Python allows us to create a custom Complex class to handle complex number operations like addition, subtraction, multiplication, division, and calculating modulus. Operations Overview Our Complex class will support the following operations ? Addition: (a + bi) + (c + di) = (a + c) + (b + d)i Subtraction: (a + bi) - (c + di) = (a - c) + (b - d)i Multiplication: (a + bi) × (c ...
Read MorePython program to print number triangle
Suppose we have a number n. We have to print a triangle with n rows where each line i contains the digit i repeated i times. So, if the input is like n = 5, then the output will be ? 1 22 333 4444 55555 Approach To solve this, we will follow these steps ? For i in range 1 to n+1, do Display (integer part of (10^i)/9*i) Go to next line Mathematical Formula The formula (10**i)//9*i works because: ...
Read MorePython program to find probability of getting letter 'a' in some letters and k sized combinations
Suppose we have an array with n different English letters and a value k. We can select k different indices with uniform distribution and need to find the probability that at least one of the k indices selected will contain the letter 'a'. For example, if we have letters = ['a', 'c', 'a', 'b', 'l', 'a', 'b', 'z'] and k = 2, we need to find all possible combinations of 2 letters and count how many contain at least one 'a'. Algorithm To solve this problem, we follow these steps − Initialize ...
Read MorePython program to check whether we can pile up cubes or not
Suppose we have an array nums containing sizes of n different cubes placed horizontally. We need to make a vertical pile of cubes following this rule: If the ith cube is on top of the jth cube, then the side length of the jth cube must be greater than or equal to the side length of the ith cube. When making the vertical pile, we can only take cubes from the left side or right side, but not from the middle. We need to check whether we can pile them up successfully or not. Problem ...
Read MoreProgram to compute gcd of two numbers recursively in Python
Finding the Greatest Common Divisor (GCD) of two numbers is a fundamental mathematical operation. The Euclidean algorithm provides an efficient recursive approach by repeatedly applying the principle that GCD(a, b) = GCD(b, a mod b). So, if the input is like a = 25, b = 45, then the output will be 5. Algorithm Steps To solve this recursively, we will follow these steps − Define a function gcd(). This will take a, b if a is same as b, then ...
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