csp 小中大

题目链接

http://118.190.20.162/view.page?gpid=T89

//小中大
#include <iostream>
#include <iomanip>
#include<cmath> 
using namespace std;
//#define Max 10000000
const int  Max = 100005; 
int a[Max];
int main()
{
	int n;
	int middle;
	double m;
	cin >> n; //输入n个数
	int s = n / 2; 
	int t = n / 2 -1;
	int sum; //接收a[s] + a[t] 
	for(int i = 0; i < n; i++)
	{
		cin >>a[i];
	} 
	if(a[0] > a[n - 1]) //降序 
	{
		if(n % 2 == 0) //偶数个数字 
		{
			sum = a[s] + a[t];
			if(sum % 2 == 0) //偶数
			{
				middle = sum / 2; 
				cout <<a[0]<<  " " << middle << " " << a[n -1];	
			} 
			else
			{
				 m = (double)middle;
				m = (double)sum / 2 ; //四舍五入+0.5 
				cout << a[0]<< " ";
				cout<<fixed<<setprecision(1)<<m; 
				cout <<" " << a[n - 1];
			}
		} 
		else if(n/2 != 0) //奇数个数字 
		{
			cout << a[0] << " " << a[(n - 1 )/2]<< " " << a[n - 1];
		} 
	}
	
	else  if(a[0] < a[n- 1]) //升序 
	{
		if(n % 2 == 0) //偶数个数字 
		{
			sum = a[s] + a[t];
			if(sum % 2 == 0) //偶数
			{
				middle = sum / 2; 
				cout <<a[n - 1]<<  " " << middle << " " << a[0];	
			} 
			else //分数情况 
			{	m = (double)middle;
				m = (double)sum / 2;
				cout << a[n - 1]<< " ";
				cout<< fixed <<setprecision(1) << m; //自动四舍五入 
				cout <<" " << a[0];
			}
		} 
		
		else if(n%2 != 0) //奇数个数字 
		{
			cout << a[n - 1] << " " << a[(n - 1 )/2]<< " " << a[0];
		} 
	} 
	else if(a[0] == a[n - 1]) //相同值 
	{
		cout << a[0] << " " << a[0]<< " " << a[0];
	}
	return 0;
}

这个是原生代码未加修改，应该有好多简化之处，以后再来补充哈哈偷懒了。