本文介绍了python中有数学nCr函数吗?的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我期待看看是否内置了python中的数学库是nCr(n选择r)函数:


据我所知,这可以编程,但我认为我会在做之前检查它是否已经内置。

解决方案

以下程序以有效的方式计算 nCr 计算阶乘因子等)

pre $ $ $ $ $ $ $导入运算符为
def ncr(n,r)
r = min(r,nr)
numer = reduce(op.mul,xrange(n,nr,-1),1)
denom = reduce(op.mul,xrange(1,r + 1) ,1)
return numer // denom


I'm looking to see if built in with the math library in python is the nCr (n Choose r) function:

I understand that this can be programmed but I thought that I'd check to see if it's already built in before I do.

解决方案

The following program calculates nCr in an efficient manner (compared to calculating factorials etc.)

import operator as op
def ncr(n, r):
    r = min(r, n-r)
    numer = reduce(op.mul, xrange(n, n-r, -1), 1)
    denom = reduce(op.mul, xrange(1, r+1), 1)
    return numer//denom

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09-21 02:35