/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		 // Example input
        int[] arr = {1, -1, 5, -2, 3};
        int k = 3;
 
        Map<Long, Integer> map = new HashMap<>();
 
        long sum = 0;
        int maxLen = 0;
 
        for (int i = 0; i < arr.length; i++) {
            sum += arr[i];
 
            // If prefix sum itself equals k
            if (sum == k) {
                maxLen = i + 1;
            }
 
            // If (sum - k) seen before
            if (map.containsKey(sum - k)) {
                maxLen = Math.max(maxLen, i - map.get(sum - k));
            }
 
            // Store first occurrence only
            if (!map.containsKey(sum)) {
                map.put(sum, i);
            }
        }
 
        System.out.println("Largest Subarray Length: " + 1);
	}
}

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