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CCF-CSP_20140901:相邻数对

2019-09-10 09:37:59
阅读：8184 • 评论：145
标签：CCF-CSP, 算法题

问题描述

给定n个不同的整数，问这些数中有多少对整数，它们的值正好相差1。

输入格式

输入的第一行包含一个整数n，表示给定整数的个数。

第二行包含所给定的n个整数。

输出格式

输出一个整数，表示值正好相差1的数对的个数。

样例输入

6
10 2 6 3 7 8

样例输出

样例说明

值正好相差1的数对包括(2, 3), (6, 7), (7, 8)。

评测用例规模与约定

1<=n<=1000，给定的整数为不超过10000的非负整数。

编程语言：Java

解题思想：

1.使用枚举法逐一比对。

2.使用Java中的Math.abs方法。

时间复杂度：O(n^2)

IDE代码如下：

package CCF_CSP;
 
import java.util.Scanner;
 
public class _20140901_100point {
 
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int n = scanner.nextInt();
		int[] num = new int[n];
 
		for(int i=0;i<n;i++)
			num[i]=scanner.nextInt();
 
		int neighbor = 0;		//相邻数对的个数
 
		for(int i=0;i<n;i++)	//枚举法
			for(int j=i+1;j<n;j++)
			{
				if(Math.abs(num[i]-num[j])==1)	//绝对值为1
				{
					neighbor++;
				}
			}
 
		System.out.println(neighbor);
	}
 
}

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