2.Lab2.2 Zig - zag sequence (Solved)

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ZigZagSequence {

    static int najdiNajdolgaCikCak(int a[]) {
        /* Non-zero elements only! */
        int len = 0;
        int max = 0;

        if (a[0] != 0) {
            len = 1;
            max = 1;
        }
        for (int i = 1; i < a.length; i++) {
            /* Product of two consecutive elements needs to be less than zero or greater than zero */
            if (a[i - 1] < 0 && a[i] > 0) {
                if (len > max) {
                    max = len;
                }
            } else if (a[i - 1] > 0 && a[i] < 0) {
                if (len > max) {
                    max = len;
                }
            } else {
                len = 0;
            }
            len++;
        }
        /* Add one for the last element */
        return max + 1;
    }

    public static void main(String[] args) throws Exception {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

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

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

        br.close();

    }

}