为什么我得到'numpy.float64'对象不能解释为整数

Question

有人可以解释为什么此代码适用于

pos= 64684571

或

pos= 64684573

但不是

pos= 64684572

import numba
import numpy as np


def choose(n, k):

    if n < k:
        return 0
    if n == k:
        return 1

    delta = imax = 0
    if k < n-k:
        delta = n-k
        imax = k
    else:
        delta = k
        imax = n-k

    ans = delta + 1
    temp = imax+1

    for i in range(2, temp):
        ans = (ans * (delta + i)) // i

    return ans


def largestV(a, b, x):

    v = numba.int64(a-1)
    while choose(v, b) > x:
        v -= 1

    return v


def calculateMth(n, k, pos):

    m = pos
    a = n
    b = k
    x = (choose(a, b) - 1) - m
    result = np.zeros(k)
    for i in range(k):
        result[i] = int(largestV(a, b, x))

        x = x - choose(result[i], b)
        a = result[i]
        b -= 1

    for i in range(k):
        result[i] = (n-1) - result[i]

    return result




if __name__ == "__main__":

    n = 200
    k = 4
    pos= 64684572
    result = calculateMth(n,k,pos)
    print (result)