poj 1631（Bridging signals LIS）nlogn

#include<iostream>
#include<cstdio>
#include<cstdlib>
#include<cstring>
using namespace std;
const int maxn=40005;
int stack[maxn];
int main()
{
    freopen("out.txt","w",stdout);
    freopen("in.txt","r",stdin);
    int n,i,top,data,j,p;
    scanf("%d",&n);
    while(n--)
    {
        scanf("%d",&p);
        top=0;stack[0]=-1;
        for(i=0;i<p;i++)
        {
            scanf("%d",&data);
            if(data>stack[top]) stack[++top]=data;
            else
            {
                int l=1,r=top,mid;
                while(l<=r)
                {
                   mid=(l+r)/2;
                   if(data>stack[mid])  l=mid+1;
                   else  r=mid-1;
                }
                stack[l]=data;
            }
        }
        printf("%d\n",top);
    }
}