Why is my vector not incrementing?

[ThisUserAgain]

I have two vectors, one with data and one without. Vector file looks like:

1 1 1 2 3 3 7 7 9 2

and vector count is filled with zeros.

for (int i = 0; i < file.size(); i++) { //loops through file until end
		if (file[i] == i) { //if [0] == 0 then
			count[i + 1] = count[i + 1] + 1; //[0] = [0] + 1;
		}
	}
	cout << "Digit Count Frequency" << endl;
	for (int p = 0; p < 9; p++) {
		cout << "  " << digit << "     " << count[p + 1] << endl;
		digit++;
	}

Current output:

Digit Count Frequency
1    0
2    1
3    0
4    0
5    0
6    0
7    0
8    1
9    0

My desired output is:

Digit Count Frequency
1    3
2    2
3    2
4    0
5    0
6    0
7    2
8    0
9    1

[ThisUserAgain]

Yes, I was trying to not use a nested for but either way that does what it needs too, thank you.