Largest subarray with 0 sum

Given an array having both positive and negative integers. The task is to compute the length of the largest subarray with sum 0.

Input:
N = 8
A[] = {15,-2,2,-8,1,7,10,23}
Output: 5
Explanation: The largest subarray with
sum 0 will be -2 2 -8 1 7.
int maxLen(int A[], int n)
{
    int maxi=0; // store max length
    int sum=0; //stores the contiguous sum
    unordered_map<int,int>m;
    for(int i=0;i<n;i++)
    {
        sum+=A[i];
        if(sum==0) // it is the largest sub array
        {
            maxi=i+1;
        }
        else{
            if(m.find(sum)!=m.end()) //if we find the same sum that means it is a sub array with zero sum
            {
                maxi=max(maxi,i-m[sum]);
            }
            else{
                m[sum]=i; //else update in hash map
            }
        }
    }
    return maxi;
}
 
 

 

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