HDU 1950 Bridging signals（LIS）

题目地址：​​点击打开链接​​

思路：LIS水题

AC代码：

#include <iostream>
#include <cstdio>
#include <cstdlib>
#include <algorithm>
#include <queue>
#include <stack>
#include <map>
#include <cstring>
#include <climits>
#include <cmath>
#include <cctype>

using namespace std;

int const maxn = 40000;
int a[maxn],stack1[maxn];

int main()
{
    int t,n,i;
    scanf("%d",&t);
    while(t--)
    {
        scanf("%d",&n);
        for(i=0; i<n; i++)
        {
            scanf("%d",&a[i]);
        }
        int top = 0;
        stack1[0] = 0;
        for(i=0; i<n; i++)
        {
            if(a[i] > stack1[top])
            {
                stack1[++top] = a[i];
            }
            else
            {
                int left = 1,right = top,mid;
                while(left <= right)
                {
                    mid = (left + right) / 2;
                    if(a[i] > stack1[mid])
                    {
                        left = mid + 1;
                    }
                    else
                    {
                        right = mid - 1;
                    }
                }
                stack1[left] = a[i];
            }
        }
        printf("%d\n",top);
    }
    return 0;
}