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 Rust (1.15.1) (judge verdict: Wrong Answer)

#![allow(non_snake_case)]
#![allow(dead_code)]
#![allow(unused_macros)]
#![allow(unused_imports)]

use std::str::FromStr;
use std::io::*;
use std::collections::*;
use std::cmp::*;

struct Scanner<I: Iterator<Item = char>> {
    iter: std::iter::Peekable<I>,
}

macro_rules! exit {
    () => {{
        exit!(0)
    }};
    ($code:expr) => {{
        if cfg!(local) {
            writeln!(std::io::stderr(), "===== Terminated =====")
                .expect("failed printing to stderr");
        }
        std::process::exit($code);
    }}
}

impl<I: Iterator<Item = char>> Scanner<I> {
    pub fn new(iter: I) -> Scanner<I> {
        Scanner {
            iter: iter.peekable(),
        }
    }

    pub fn safe_get_token(&mut self) -> Option<String> {
        let token = self.iter
            .by_ref()
            .skip_while(|c| c.is_whitespace())
            .take_while(|c| !c.is_whitespace())
            .collect::<String>();
        if token.is_empty() {
            None
        } else {
            Some(token)
        }
    }

    pub fn token(&mut self) -> String {
        self.safe_get_token().unwrap_or_else(|| exit!())
    }

    pub fn get<T: FromStr>(&mut self) -> T {
        self.token().parse::<T>().unwrap_or_else(|_| exit!())
    }

    pub fn vec<T: FromStr>(&mut self, len: usize) -> Vec<T> {
        (0..len).map(|_| self.get()).collect()
    }

    pub fn mat<T: FromStr>(&mut self, row: usize, col: usize) -> Vec<Vec<T>> {
        (0..row).map(|_| self.vec(col)).collect()
    }

    pub fn char(&mut self) -> char {
        self.iter.next().unwrap_or_else(|| exit!())
    }

    pub fn chars(&mut self) -> Vec<char> {
        self.get::<String>().chars().collect()
    }

    pub fn mat_chars(&mut self, row: usize) -> Vec<Vec<char>> {
        (0..row).map(|_| self.chars()).collect()
    }

    pub fn line(&mut self) -> String {
        if self.peek().is_some() {
            self.iter
                .by_ref()
                .take_while(|&c| !(c == '\n' || c == '\r'))
                .collect::<String>()
        } else {
            exit!();
        }
    }

    pub fn peek(&mut self) -> Option<&char> {
        self.iter.peek()
    }
}

trait BinarySearch<T: Ord> {
    fn lower_bound(&self, x: T) -> usize;
    fn upper_bound(&self, x: T) -> usize;
}

impl<T: Ord> BinarySearch<T> for Vec<T> {
    fn lower_bound(&self, x: T) -> usize {
        let mut ok = self.len() as i64;
        let mut ng = -1;
        while (ok - ng).abs() > 1 {
            let mid = (ok + ng) / 2;
            if x <= self[mid as usize] {
                ok = mid;
            } else {
                ng = mid;
            }
        }
        ok as usize
    }
    fn upper_bound(&self, x: T) -> usize {
        let mut ok = self.len() as i64;
        let mut ng = -1;
        while (ok - ng).abs() > 1 {
            let mid = (ok + ng) / 2;
            if x < self[mid as usize] {
                ok = mid;
            } else {
                ng = mid;
            }
        }
        ok as usize
    }
}

const INF: usize = 1 << 60;

fn main() {
    let cin = stdin();
    let cin = cin.lock();
    let mut sc = Scanner::new(cin.bytes().map(|c| c.unwrap() as char));
    let N: usize = sc.get();
    let A: Vec<usize> = sc.vec(N);
    let mut ans = 0usize;
    let mut painted = vec![false; N];
    loop {
        let mut finished = true;
        let mut dp = vec![INF; N];
        let mut index = vec![INF; N];
        for i in 0..N {
            if painted[i] {
                continue;
            }
            finished = false;
            let j = dp.lower_bound(A[i]);
            if A[i] < dp[j] {
                dp[j] = A[i];
                index[j] = i;
            }
        }
        for i in 0..N {
            if index[i] == INF {
                break;
            }
            painted[index[i]] = true;
        }
        if finished {
            break;
        }
        ans += 1;
    }
    println!("{}", ans);
}