factorial

141+ posts

Count Distinct Hexadecimals from Subsequences

Last Updated: 17 September 2026

Given a hexadecimal string s, you can form a new hexadecimal number by selecting any non-empty subsequence of its characters and rearranging the selected characters in any...read more

Factorial Coding Problems

Last Updated: 23 July 2025

Factorialof a number n is defined as the product of all the positive numbers less than n. In other words, Factorial of a number n can be calculated as: n × (n – 1) × (n – ...read more

Mathematical

DSA

factorial

Interesting Facts about Factorial

Last Updated: 23 July 2025

Factorial of n or n! mainly represents different ways to arrange n items. For example, 3 items ABC can be arranged 3! = 3 x 2 x 1 = 6 ways. The ways are ABC, ACB, BAC, BC...read more

Mathematics

School Learning

factorial

C++ Program to Find Factorial of a Number Using Dynamic Programming

Last Updated: 23 July 2025

The Factorial of a number N can be defined as the product of numbers from 1 to the number N. More formally factorial of n can be defined by function,f(n) = 1 \times 2 \tim...read more

C++ Program to Find Factorial Using Recursion

Last Updated: 23 July 2025

The factorial of a number is denoted by "n!" and it is the product of all positive integers less than or equal to n. In this article, we will learn how to find the factori...read more

C++ Programs

C++

Picked

Basic Coding Problems

factorial

recursive-approach

CPP Examples

C++ Program to Find Factorial of a Number Using Iteration

Last Updated: 23 July 2025

Factorial of a number n is the product of all integers from 1 to n. In this article, we will learn how to find the factorial of a number using iteration in C++.ExampleInpu...read more

C++ Programs

C++

Picked

Basic Coding Problems

factorial

CPP Examples

GFact | Why Factorial of 0 is 1?

Last Updated: 04 October 2023

Have you ever thought about why the factorial of 0 is 1? If yes then here you can find the justification for the same.why factorial of 0(0!) is 1?Factorial of Number:Facto...read more

Find sum of factorials till N factorial (1! + 2! + 3! + ... + N!)

Last Updated: 29 February 2024

Given a positive integer N. The task is to compute the sum of factorial from 1! to N!, 1! + 2! + 3! + ... + N!.Examples:Input: N = 5Output: 153Explanation: 1! + 2! + 3! + ...read more

Find subfactorial of a number

Last Updated: 23 July 2025

Given an integer N, the task is to find the subfactorial of the number represented as !N. The subfactorial of a number is defined using below recurrence relation of a numb...read more

Count of N-bit odd and even integers with K set bits

Last Updated: 23 July 2025

Given two positive integers N and K, the task is to count the number of even and odd integers consisting of N bits, out of which K bits are set.Examples:Input: N = 5, K = ...read more

Permutation and Combination

Find remainder when a number A raised to N factorial is divided by P

Last Updated: 23 July 2025

Given three integers A, N and P, the task is to find (A^(N!)) % P.Examples:Input: A = 2, N = 1, P = 2Output: 0Explanation: As (2^(1!)) = 2Therefore 2 % 2 will be 0.Input: ...read more

Recursive Program to find Factorial of a large number

Last Updated: 23 July 2025

Given a large number N, the task is to find the factorial of N using recursion.Factorial of a non-negative integer is the multiplication of all integers smaller than or eq...read more

DSA

factorial

large-numbers

Find the suffix factorials of a suffix sum array of the given array

Last Updated: 23 July 2025

Given an array arr[] consisting of N positive integers, the task is to find the suffix factorials of a suffix sum array of the given array.Examples:Input: arr[] = {1, 2, 3...read more

Exponential factorial of N

Last Updated: 23 July 2025

Given a positive integer N, the task is to print the Exponential factorial of N. Since the output can be very large, print the answer modulus 1000000007.Examples: Input: N...read more

Mathematical

DSA

factorial

Factorial of a number without using multiplication

Last Updated: 23 July 2025

Given a positive number N, the task is to calculate the factorial of N without using the multiplication operator.Examples:Input: N = 5Output:120Explanation:5*4*3*2*1=120In...read more

DSA

factorial

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