Subsequence sum

Question

Given an array of integers eg [1, 2, -3, 1] find whether there is a sub-sequence that sums to 0 and return it (eg [1, 2, -3] or [2,

Answer 1

Below is the java implementation of the solution suggested by @Fabricio

    public static int countAllSubSequenceForZeroSum(int[] array) {
    int count = 0;
    Map encounteredSum = new HashMap<>();
    int prev = array[0];
    if(prev == 0) {
        count++;
        System.out.println("Found at index: "+0);
    }
    for (int i = 1; i < array.length; i++) {
        prev += array[i];
        if(encounteredSum.containsKey(prev)) {
            System.out.println("Found at index: "+i+ " start index: "+encounteredSum.get(prev));
            printSequenceForZeroSum(array, i);
            count++;
        } else {
            encounteredSum.put(prev, i);
        }
    }
    return count;
}

public static void printSequenceForZeroSum(int[] array, int endIndex) {
    int sum = array[endIndex];
    while(sum!=0) {
        System.out.print(array[endIndex]+ "  ");
        sum += array[--endIndex];
    }
    System.out.println(array[endIndex]);
}