A1029 Median [two pointers]

简单的sort排序找中间数字不行，复杂度太高了，然后就要巧妙一点的方法，还有他题目没说要是偶数个取前面奇数位加一的数字，我以为取平均数。

#include<iostream>
#include<cstring>
#include<algorithm>
#include<string>
#include<time.h>
using namespace std;
const int maxn = 1000001; 
 int a[maxn], b[maxn];
int main()
{
	int n, m, index = 0;
	cin >> n;
	for (int i = 0; i < n; i++)
	{
		scanf("%d", &a[i]);
	}
	cin >> m;
	for (int i = 0; i < m; i++)
	{
		scanf("%d", &b[i]);
	}
	int medianpos = (n + m - 1) / 2;
	a[n] = b[m] = 10000000000001;
	int i = 0, j = 0, count = 0;
	while (count < medianpos)
	{
		if (a[i] < b[j]) i++;
		else j++;
		count++;
	}
	if (a[i] < b[j])
	{
		printf("%d\n", a[i]);
	}
	else
	{
		printf("%d\n", b[j]);
	}
	return 0;
}