给定一个非负整数数组表示一组分数。
你可以假设所有输入数字均为非负整数。
You may assume all Numbers in the input are non-negative integers.
每个参数必须是计算结果为非负整数的表达式。
Each argument must be an expression that evaluates to a nonnegative integer.
第二行是一个不大于五千的非负整数，表示你提问的次数。
In the second line, there is one non-negative integer which is the number of questions asked and answers to them.
本文引进了一个新的记号，研究色多项式的根全为非负整数的图的色性。
In this paper, a new character is used. When all roots of chromatic polynomials of graphs are not minus integers, the author studies the chromaticity of them.
给定一个非负整数，将该整数的所有数字的和作为新的整数，重复直至得到只有一个数的整数。
Given a non-negative integer num, repeatedly add all its digits until the result has only one digit.
给定一组非负整数代表每一件房屋的金钱数，求解在不惊动警察的情况下一晚上最多可以抢到的钱数。
Given a list of non-negative integers representing the amount of money of each house, determine the maximum amount of money you can rob tonight without alerting the police.
最后的值必须是一个小于该序列长度的非负整数，然后该序列就被请求将被赋对象赋值给它带那个指标的项。
The resulting value must be a nonnegative integer less than the sequence's length, and the sequence is asked to assign the assigned object to its item with that index.
汪荣明（1993）求出了状态空间为非负整数集的随机环境中随机游动的灭绝概率，并得到明确的表达式。
Wang Rongming(1993) calculated the extinction probabilities for a class of random walk in a random environment with the set of non-negative integers as state space.
给定一列非负整数，代表每间房屋的金钱数，计算出在不惊动警察的前提下一晚上最多可以打劫到的金钱数。
Given a list of non-negative integers representing the amount of money of each house, determine the maximum amount of money you can rob tonight without alerting the police.
本文给出一个不定方程非负整数解的组数的组合计数公式，说明了它在求解一类与数字有关的古典概率方面的应用。
This paper introduces the problems of some identical equation solved by the numerical characters of the classic probability and stochastic variable.
第一个基准条件用来处理非整数；第二个用来处理负整数。在小数或者负数做参数的时候，函数就会输出错误信息，返回空到调用出来表明出错了。
The first base case handles nonintegers; the second handles negative integers. In both cases, the program prints an error message and returns None to indicate that something went wrong.
第一个基准条件用来处理非整数；第二个用来处理负整数。在小数或者负数做参数的时候，函数就会输出错误信息，返回空到调用出来表明出错了。
The first base case handles nonintegers; the second handles negative integers. In both cases, the program prints an error message and returns None to indicate that something went wrong.
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