Revise paste Untitled

import java.awt.event.MouseAdapter;
import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ZigZagSequence {

static int[] niza, dp;
    static int rec(int idx) {
        if(idx == niza.length - 1) {
            return 1;
        }
        if(dp[idx] != -1) {
            return dp[idx];
        }
        int result = 1;
        for(int i = idx + 1; i < niza.length; i++) {
            if(niza[idx] < 0) {
                if(niza[i] > 0) {
                    result = Math.max(result, rec(i) + 1);
                }
            }
            else if(niza[idx] > 0) {
                if(niza[i] < 0) {
                    result = Math.max(result, rec(i) + 1);
                }
            }
        }
        dp[idx] = result;
        return result;
    }

static int najdiNajdolgaCikCak(int a[]) {
        niza = a;
        dp = new int[a.length];
        for(int i = 0; i < a.length; i++) {
            dp[i] = -1;
        }
        int result = 0;
        for(int i = 0; i < a.length; i++) {
            result = Math.max(result, rec(i));
        }
        return result;
    }

public static void main(String[] args) throws Exception {
        int i,j,k;

BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

int N = Integer.parseInt(br.readLine());
        int a[] = new int[N];
        for (i=0;i<N;i++)
            a[i] = Integer.parseInt(br.readLine());

int rez = najdiNajdolgaCikCak(a);
        System.out.println(rez);

br.close();

}