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P1014_Cantor表 (JAVA语言)
阅读量:151 次
发布时间:2019-02-27

本文共 787 字,大约阅读时间需要 2 分钟。

题目描述

现代数学的著名证明之一是Georg Cantor证明了有理数是可枚举的。他是用下面这一张表来证明这一命题的:

1/11/1 , 1/21/2 , 1/31/3 , 1/41/4, 1/51/5, …

2/12/1, 2/22/2 , 2/32/3, 2/42/4, …

3/13/1 , 3/23/2, 3/33/3, …

4/14/1, 4/24/2, …

5/15/1, …

… 我们以ZZ字形给上表的每一项编号。第一项是1/11/1,然后是1/21/2,2/12/1,3/13/1,2/22/2,…

输入输出格式

输入格式:

 

整数NN(1≤N≤100000001≤N≤10000000)

 

输出格式:

 

表中的第NN项

 

输入输出样例

输入样例#1: 复制

7

输出样例#1: 复制

1/4
import java.util.Scanner;public class P1014_Cantor表 {	public static void main(String[] args) {		// TODO Auto-generated method stub		Scanner in=new Scanner(System.in);		int n=in.nextInt();		int a[]=new int[1000000];		a[1]=1;		int c=1;		for(int i=2;i
=n){ c=i; break; } } if(c%2==0) { System.out.println(n-a[c-1]+"/"+((c+1)-(n-a[c-1]))); } if(c%2==1) { System.out.println(((c+1)-(n-a[c-1]))+"/"+(n-a[c-1])); } }}

 

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