各位大侠,请帮忙解释这道程序题是要我们解决什么
一下是我搞不懂的几个名词:anti-primesequence,acomposite(non-prime)number。我是看不懂它,请大家帮帮忙,解释它是叫我们干什么,...
一下是我搞不懂的几个名词:anti-prime sequence ,a composite (non-prime) number。我是看不懂它,请大家帮帮忙,解释它是叫我们干什么,排什么样的序
Problem
Given a sequence of consecutive integers n,n+1,n+2,...,m, an anti-prime sequence is a rearrangement of these integers so that each adjacent pair of integers sums to a composite (non-prime) number. For example, if n = 1 and m = 10, one such anti-prime sequence is 1,3,5,4,2,6,9,7,8,10. This is also the lexicographically first such sequence. We can extend the definition by defining a degree danti-prime sequence as one where all consecutive subsequences of length 2,3,...,d sum to a composite number. The sequence above is a degree 2 anti-prime sequence, but not a degree 3, since the subsequence 5, 4, 2 sums to 11. The lexicographically .rst degree 3 anti-prime sequence for these numbers is 1,3,5,4,6,2,10,8,7,9.
Input
Input will consist of multiple input sets. Each set will consist of three integers, n, m, and d on a single line. The values of n, m and d will satisfy 1 <= n < m <= 1000, and 2 <= d <= 10. The line 0 0 0 will indicate end of input and should not be processed.
Output
For each input set, output a single line consisting of a comma-separated list of integers forming a degree danti-prime sequence (do not insert any spaces and do not split the output over multiple lines). In the case where more than one anti-prime sequence exists, print the lexicographically first one (i.e., output the one with the lowest first value; in case of a tie, the lowest second value, etc.). In the case where no anti-prime sequence exists, output No anti-prime sequence exists.
Sample Input
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1 10 2
1 10 3
1 10 5
40 60 7
0 0 0
Sample Output
1,3,5,4,2,6,9,7,8,10
1,3,5,4,6,2,10,8,7,9
No anti-prime sequence exists.
40,41,43,42,44,46,45,47,48,50,55,53,52,60,56,49,51,59,58,57,54 展开
Problem
Given a sequence of consecutive integers n,n+1,n+2,...,m, an anti-prime sequence is a rearrangement of these integers so that each adjacent pair of integers sums to a composite (non-prime) number. For example, if n = 1 and m = 10, one such anti-prime sequence is 1,3,5,4,2,6,9,7,8,10. This is also the lexicographically first such sequence. We can extend the definition by defining a degree danti-prime sequence as one where all consecutive subsequences of length 2,3,...,d sum to a composite number. The sequence above is a degree 2 anti-prime sequence, but not a degree 3, since the subsequence 5, 4, 2 sums to 11. The lexicographically .rst degree 3 anti-prime sequence for these numbers is 1,3,5,4,6,2,10,8,7,9.
Input
Input will consist of multiple input sets. Each set will consist of three integers, n, m, and d on a single line. The values of n, m and d will satisfy 1 <= n < m <= 1000, and 2 <= d <= 10. The line 0 0 0 will indicate end of input and should not be processed.
Output
For each input set, output a single line consisting of a comma-separated list of integers forming a degree danti-prime sequence (do not insert any spaces and do not split the output over multiple lines). In the case where more than one anti-prime sequence exists, print the lexicographically first one (i.e., output the one with the lowest first value; in case of a tie, the lowest second value, etc.). In the case where no anti-prime sequence exists, output No anti-prime sequence exists.
Sample Input
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1 10 2
1 10 3
1 10 5
40 60 7
0 0 0
Sample Output
1,3,5,4,2,6,9,7,8,10
1,3,5,4,6,2,10,8,7,9
No anti-prime sequence exists.
40,41,43,42,44,46,45,47,48,50,55,53,52,60,56,49,51,59,58,57,54 展开
1个回答
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anti-prime sequence
非素序列
a composite (non-prime) number
一个合成的非素数字
非素,即不是素数的数,即不是(除了可以被1和自身整除的数),即除了1和自身外,还有其它的因子的数。 比如7是一个素数,但是9不是一个素数,因为9=3*3,15也不是一个素数,但是19是一个素数,判断一个数是不是素数,你可以做成一个函数去判断,这里不在你的问题之列,所以具体我就不说了,具体方法可以到网上找,很容易找到。
这个要排的序是这样的:
如果输入的是:
1 10 2
0 0 0
那么表示参与排序的数字是从1开始,到10结束之间的整数
(即1,2,3,4,5,6,7,8,9,10),
2表示非素序列相邻的位数,拿结果来解释:
1,3,5,4,2,6,9,7,8,10
(1+3)=4,非素
(3+5)=8,非素
(5+4)=9,非素
……
(8+10)=18,非素
而如果输入的是
1 10 3
参与排序的数字仍然是从1开始,到10结束之间的整数,但是非素序列相邻的位数要求是3,则我们来看刚才位数是2的结果:
1,3,5,4,2,6,9,7,8,10
(1+3+5)=9,非素
(3+5+4)=12,非素
(5+4+2)=11,不是非素,是一个素数
那么序列到这里就说明1,3,5之后的不应该是2,那么程序就应该判断下一个没有选择的数即:6,
(5+4+6)=15,非素
所以,这个序列是:
1,3,5,6,……
如果从头到位无法找到满足非素位数的序列,那么输出:
No anti-prime sequence exists.
就行了,
如果存在,则以逗号分隔,输出你找到的序列。
非素序列
a composite (non-prime) number
一个合成的非素数字
非素,即不是素数的数,即不是(除了可以被1和自身整除的数),即除了1和自身外,还有其它的因子的数。 比如7是一个素数,但是9不是一个素数,因为9=3*3,15也不是一个素数,但是19是一个素数,判断一个数是不是素数,你可以做成一个函数去判断,这里不在你的问题之列,所以具体我就不说了,具体方法可以到网上找,很容易找到。
这个要排的序是这样的:
如果输入的是:
1 10 2
0 0 0
那么表示参与排序的数字是从1开始,到10结束之间的整数
(即1,2,3,4,5,6,7,8,9,10),
2表示非素序列相邻的位数,拿结果来解释:
1,3,5,4,2,6,9,7,8,10
(1+3)=4,非素
(3+5)=8,非素
(5+4)=9,非素
……
(8+10)=18,非素
而如果输入的是
1 10 3
参与排序的数字仍然是从1开始,到10结束之间的整数,但是非素序列相邻的位数要求是3,则我们来看刚才位数是2的结果:
1,3,5,4,2,6,9,7,8,10
(1+3+5)=9,非素
(3+5+4)=12,非素
(5+4+2)=11,不是非素,是一个素数
那么序列到这里就说明1,3,5之后的不应该是2,那么程序就应该判断下一个没有选择的数即:6,
(5+4+6)=15,非素
所以,这个序列是:
1,3,5,6,……
如果从头到位无法找到满足非素位数的序列,那么输出:
No anti-prime sequence exists.
就行了,
如果存在,则以逗号分隔,输出你找到的序列。
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