Submission #111222

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Source Code Expand

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ABC0002C
{
    class Program
    {
        public static void Main(string[] args)
        {
            var n = Console.ReadLine().Split().Select((s) => (int.Parse(s))).ToArray();
            int ax = n[0], ay = n[1], bx = n[2], by = n[3], cx = n[4], cy = n[5];
            double[] l = new[] {threef(ax, ay, bx, by), threef(bx, by, cx, cy), threef(cx, cy, ax, ay)};
            double S = l.Sum() / 2.0;
            Console.WriteLine(Math.Sqrt(l.Select((x)=>(S - x)).Aggregate((x, y)=>(x * y)) * S));
        }

        public static double threef(int ax, int ay, int bx, int by)
        {
            return Math.Sqrt(Math.Pow(Math.Abs(ax - bx), 2.0) + Math.Pow(Math.Abs(bx - by), 2.0));
        }
    }
}

Submission Info

Judge Result