第一種方法是利用隨機數來判斷，可以得出花費100塊錢，買各種各樣總和為100只的雞

# author : momo
'''
百錢買百雞，現有100文錢，公雞5文錢一隻，母雞3文錢一隻，
小雞一文錢3只，要求：公雞，母雞，小雞都要有，把100文錢
買100只雞，買的雞是整數。多少隻公雞，多少隻母雞多少隻小雞？
'''
import  random
a = True
while a:
    a = 91
    list1 = ['公雞', '母雞', '小雞']
    gongji = 1
    muji = 1
    xiaoji = 3
    while 0<=a<=91 :
        if random.choice(list1)=='公雞':
            gongji = gongji + 1
            a = a - 5
        elif random.choice(list1)=='母雞':
            muji = muji + 1
            a = a - 3
        elif random.choice(list1)=='小雞':
            xiaoji = xiaoji + 3
            a = a - 1
        if a==0:
            print("公雞有%d只，母雞有%d只，小雞有%d只,餘額=%d" % (gongji, muji, xiaoji, a))
            a = False
            break
        else:
            continue
 

第二種方法是：只得出一種花費100塊錢來購買100只的雞的方法

for i in range(1,20):
    for j in range(1,33):
        for k in range(3,98,3):
            if i+j+k==100 and 5*i + 3*j + k//3 ==100:
                print("公雞：",i,"母雞：",j,"小雞：",k)