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prefix_sum.cpp
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prefix_sum.cpp
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// { Driver Code Starts
// A C++ program to find if there is a zero sum
// subarray
#include <bits/stdc++.h>
using namespace std;
// } Driver Code Ends
class Solution
{
public:
//Complete this function
//Function to check whether there is a subarray present with 0-sum or not.
bool subArrayExists(int arr[], int n)
{
//Your code here
int f = 0, s = 0;
unordered_map<int, int> m;
for (int i = 0; i < n; i++)
{
s += arr[i];
if (s == 0 or m[s] or arr[i] == 0)
{
f = 1;
break;
}
else
{
m[s] = 1;
}
}
if (f == 1)
return 1;
else
return 0;
}
};
// { Driver Code Starts.
// Driver code
int main()
{
int t;
cin >> t;
while (t--)
{
int n;
cin >> n;
int arr[n];
for (int i = 0; i < n; i++)
cin >> arr[i];
Solution obj;
if (obj.subArrayExists(arr, n))
cout << "Yes\n";
else
cout << "No\n";
}
return 0;
} // } Driver Code Ends