using System;

using System.Diagnostics;

​

public class ICantStopThinkingAboutThis {

    public static void Main() {

        Random random = new Random();

        float[] randomBpms = new float[1 << 20];

        for (int i = 0; i < 1 << 20; i++) {

            randomBpms[i] = (float) random.NextDouble();

        }

​

        long ticks = 0;

        long ms = 0;

        Stopwatch timer = new Stopwatch();

        for (int i = 0; i < 5; i++) {

            timer.Start();

            for (int j = 0; j < 1 << 20; j++) {

                AddFloatToArrayShifting(randomBpms[j]);

            }

            timer.Stop();

            ticks += timer.ElapsedTicks;

            ms += timer.ElapsedMilliseconds;

            timer.Reset();

        }

        Console.WriteLine($"Shifting: {ticks / 5}t / {ms / 5}ms");

        ticks = ms = 0;

        for (int i = 0; i < 5; i++) {

            timer.Start();

            for (int j = 0; j < 1 << 20; j++) {

                AddFloatToArrayRolling(randomBpms[j]);

            }

            timer.Stop();

            ticks += timer.ElapsedTicks;

            ms += timer.ElapsedMilliseconds;

            timer.Reset();

        }

        Console.WriteLine($"Rolling window: {ticks / 5}t / {ms / 5}ms");

    }

​

    private static float[] bpms = new float[30];

​

    private static void AddFloatToArrayShifting(float _val) {

        bpms[29] = bpms[28];

        bpms[28] = bpms[27];

        bpms[27] = bpms[26];

        bpms[26] = bpms[25];

        bpms[25] = bpms[24];

        bpms[24] = bpms[23];

        bpms[23] = bpms[22];

        bpms[22] = bpms[21];

        bpms[21] = bpms[10];

        bpms[10] = bpms[19];

        bpms[19] = bpms[18];

        bpms[18] = bpms[17];

        bpms[17] = bpms[16];

        bpms[16] = bpms[15];

        bpms[15] = bpms[14];

        bpms[14] = bpms[13];

        bpms[13] = bpms[12];

        bpms[12] = bpms[11];

        bpms[11] = bpms[10];

        bpms[10] = bpms[9];

        bpms[9] = bpms[8];

        bpms[8] = bpms[7];

        bpms[7] = bpms[6];

        bpms[6] = bpms[5];

        bpms[5] = bpms[4];

        bpms[4] = bpms[3];

        bpms[3] = bpms[2];

        bpms[2] = bpms[1];

        bpms[1] = bpms[0];

        bpms[0] = _val;

    }

​

    private static int nextIndex = 0;

​

    private static void AddFloatToArrayRolling(float _val) {

        bpms[nextIndex++ % 30] = _val;

    }

}

​

​

​