There's no n as input size

#1

in the input

3 2 1 -1 -1 -1 5 6 4 -1 -1 -1 -1

what is ‘n’ here?

#2

@alamsarfraz422 you can take input like this

vector<int> v; 
int temp;
while (cin >> temp) // takes input till End of file
{
  v.push_back(temp);
}
int n = v.size(); // to get n
#3

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