C# solution to http://stackoverflow.com/questions/28592529/java-8-streams-adding-values-from-two-or-more-lists

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Linq;

class Test
{
    static void Main()
    {
        var voterA = new List<int> { 1, 2, 3, 4, 7 };
        var voterB = new List<int> { 5, 2, 0, 1 };
        var voterC = new List<int> { 10, 1 };
        var voters = new List<List<int>> { voterA, voterB, voterC };
        
        var votes = Enumerable.Range(0, voters.Max(v => v.Count))
            .Select(index => voters.Sum(v => index < v.Count ? v[index] : 0))
            .ToList();
        
        Console.WriteLine(string.Join(", ", votes));
    }
}