NYOJ-214 单调递增子序列(二) AC

#include
#include

int len, n, i, j; 

int d[100005], a[100005];
 
int binsearch(int x) 

{ 

	int l = 1, r = len, mid;

	while (l <= r)

	{    

		mid = (l + r) >> 1;

		if (d[mid-1] <= x && x < d[mid]) return mid;

		else if (x > d[mid]) l = mid + 1;

		else r = mid - 1;     

	}  

}

int main()

{

	while(scanf ("%d", &n)!=EOF)
	
	{
	

	for (i = 1; i<= n; i++)

		scanf ("%d", &a[i]);

		memset (d, 0, sizeof (d));

		d[1] = a[1];

		len = 1;

		for (i = 2; i <= n; i++)

		{   

			if (a[i] < d[1]) j = 1;

			else if (a[i] > d[len]) j = ++len;

			else j = binsearch (a[i]);

			d[j] = a[i];   

		}

		printf ("%d\n", len);  
	}
return 0;

}

以上是AC的代码，来源于：http://qiemengdao.iteye.com/blog/1660229

很好的一篇文章，可以解释公共子序列的很多问题