Problem:
Score : 500 points

Problem Statement

You are given a sequence with N integers: A = \{ A_1, A_2, \cdots, A_N \}.
For each of these N integers, we will choose a color and paint the integer with that color. Here the following condition must be satisfied:

If A_i and A_j (i < j) are painted with the same color, A_i < A_j.

Find the minimum number of colors required to satisfy the condition.

Constraints

1 \leq N \leq 10^5

0 \leq A_i \leq 10^9

Input

Input is given from Standard Input in the following format:

N
A_1
:
A_N

Output

Print the minimum number of colors required to satisfy the condition.

Sample Input 1

5
2
1
4
5
3

Sample Output 1

2

We can satisfy the condition with two colors by, for example, painting 2 and 3 red and painting 1, 4, and 5 blue.

Sample Input 2

4
0
0
0
0

Sample Output 2

4

We have to paint all the integers with distinct colors.

Solution in C++14 (GCC 5.4.1) (judge verdict: Accepted)

#include<bits/stdc++.h>
using namespace std;
int N;
int main() {
    cin >> N;
    int a[N];
    for (int i = 0; i < N; i++)
    {
        cin >> a[i];
    }

    vector<int> b;
    b.push_back(a[N-1]);
    for (int i = 1; i < N; i++)
    {
        if(a[N-1-i] >= b[b.size()-1]) b.push_back(a[N-1-i]);
        else{
            auto c = upper_bound(b.begin(), b.end(), a[N-1-i]);
            b[c - b.begin()] = a[N-1-i];
        }
    }

    cout << b.size() << endl;
}