100元买100只鸡：公鸡、母鸡、小鸡组合计算
def chicken(): for cock in range(21): for hen in range(34): chick = 100 - cock - hen if chick % 3 == 0 and 5 * cock + 3 * hen + chick // 3 == 100: print('公鸡：%d只，母鸡：%d只，小鸡：%d只' % (cock, hen, chick))
chicken()
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