[백준] 11054번 가장 긴 바이토닉 부분 수열 (gold 4

import java.io.*;
import java.util.*;

public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw=new BufferedWriter(new OutputStreamWriter(System.out));
        int n=Integer.parseInt(br.readLine());
        int[][] dp=new int[n][3];
        StringTokenizer st=new StringTokenizer(br.readLine());
        for(int i=0; i<n; i++){
            dp[i][0]=Integer.parseInt(st.nextToken());
        }

        for(int i=0; i<n; i++){
            dp[i][1]++; //증가부분
            for(int j=i+1; j<n; j++){
                if(dp[j][0]>dp[i][0]){
                    dp[j][1]=Math.max(dp[i][1],dp[j][1]);
                }
            }
        }

        for(int i=n-1; i>=0; i--){
            dp[i][2]++; //감소부분
            for(int j=i-1; j>=0; j--){
                if(dp[j][0]>dp[i][0]){
                    dp[j][2]=Math.max(dp[i][2],dp[j][2]);
                }
            }
        }

        int max=0;
        for(int i=0; i<n; i++){
            int temp=dp[i][1]+dp[i][2]-1;
            max= max > temp ? max : temp;
        }

        bw.write(max+"");
        bw.flush();
    }

}