Adding NcR(modulo)m using inverse factorial in c++

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Description

Contributor guide

Research direction

Understand the concept of modular inverse using Fermat's little theorem, precompute factorials and inverse factorials up to N, then implement NcR = fact[N] * invfact[R] * invfact[N R] % m.

Tech stack

cpp

Domain

backend

Issue type

Feature

DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.

3

Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.

1-3 hours

Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.

Active

ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.

Clear

Prerequisites

GitC++

Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.

60