Summing the previous values in an IEnumerable

Question

I have a sequence of numbers:

var seq = new List<int> { 1, 3, 12, 19, 33 };

and I want to transform that into a new sequence where the number is added to the preceding numbers to create a new sequence:

{ 1, 3, 12, 19, 33 } --> {1, 4, 16, 35, 68 }

I came up with the following, but I dislike the state variable 'count'. I also dislike the fact that I'm using the values Enumerable without acting on it.

int count = 1;
var summed = values.Select(_ => values.Take(count++).Sum());

How else could it be done?

Answer 1

var seq = new List<int> { 1, 3, 12, 19, 33 }; 

for (int i = 1; i < seq.Count; i++)
{
   seq[i] += seq[i-1];
}