с float при C# се оправя 100/100

using System;
using System.Linq;
class SoftUni {
    static void Main() {
        var nums = Console.ReadLine().Split().Select(int.Parse).ToList();
        float timeL = 0;
        float timeR = 0;
        for (int i = 0; i < nums.Count / 2; ++i) {
            timeL += nums[i];
            if (nums[i] == 0) {
                timeL *= 0.8f;
            }
        }
        for (int i = nums.Count - 1; i > nums.Count / 2; --i) {
            timeR += nums[i];
            if (nums[i] == 0) {
                timeR *= 0.8f;
            }
        }
        if (timeL < timeR) {
            Console.WriteLine($"The winner is left with total time: {timeL}");
        } else {
            Console.WriteLine($"The winner is right with total time: {timeR}");
        }
    }
}