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CCF-CSP_20140301:相反数

2019-09-10 09:32:27
阅读：8404 • 评论：153
标签：CCF-CSP, 算法题

问题描述

有 N 个非零且各不相同的整数。请你编一个程序求出它们中有多少对相反数(a 和 -a 为一对相反数)。

输入格式

第一行包含一个正整数 N。(1 ≤ N ≤ 500)。

第二行为 N 个用单个空格隔开的非零整数,每个数的绝对值不超过1000,保证这些整数各不相同。

输出格式

只输出一个整数,即这 N 个数中包含多少对相反数。

样例输入

5
1 2 3 -1 -2

样例输出

编程语言：Java

解题思想：

1.用枚举法逐一比对。

时间复杂度：O(n^2)

IDE代码如下：

package CCF_CSP;
 
import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;
 
public class _20140301_100point {
 
	public static void main(String[] args) {
		Scanner scanner = new Scanner(System.in);
		int N = scanner.nextInt();
		List<Integer> num = new ArrayList<Integer>();
 
		for(int i=0;i<N;i++)
			num.add(scanner.nextInt());
 
		int opposite = 0;	//相反数个数
 
		for(int i=0;i<num.size();i++)		//枚举
		{
			for(int j=i+1;j<num.size();j++)
			{
				if(num.get(i)==num.get(j)*(-1))	//逐一比对
				{
					opposite++;
				}
			}
		}
 
 
		System.out.println(opposite);
 
	}
 
}

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