Can a c++ program have alternate output results every time you execute with the same input?

I have framed an error into a question.

I keep getting 2 output results alternating randomly(sometimes its '1' and sometimes its '0',even though the input is same .

can someone explain me why is this happening? compiler issue?

i am pretty sure a set of commands with same input cant change it's output every time you run it.

#include <iostream>
using namespace std;
int main() 
{
  int n;
  cin>>n;




  for(int i=0;i<n;i++)
  {



    int N ,M;

    cin>>M>>N;


    int arr[N];
    int turn=-1;
    char win='D';
    for(int i=0;i<N;i++)
    {
      if(M>0)
      { 
        if(turn==-1)
        {
          M=M-arr[i];
          win='D';
        }
        else if(turn==1)
        {
          M=M-arr[i];
          win='K';
        }
      }
      else
        break;

      turn=turn*-1;
    }

    if(win=='K')
    {
      cout<<"Kate"<<endl;
    }
    else if(win=='D')
    {
      cout<<"Little Deepu"<<endl;
    }
  }

    return 0;
}