using System.Collections;

using System.Collections.Generic;

using UnityEngine;

public class TimeDuiBi : MonoBehaviour

{

    List<int> list = new List<int>();

    private void Start()

    {

        for (int i = 0; i < 3000000; i++)

        {

            list.Add(i);

        }

    }

    private void Update()

    {

        if (Input.GetKeyDown(KeyCode.Space))

        {

            System.Diagnostics.Stopwatch stopwatch = new System.Diagnostics.Stopwatch();

            stopwatch.Start();

            int temp1 = 0;

            int cout = list.Count;

            for (int i = 0; i < cout; i++)

            {

                temp1 += list[i];

            }

            stopwatch.Stop();

            Debug.Log("for time=: " + stopwatch.Elapsed.TotalMilliseconds + "temp1:" + temp1);

            System.Diagnostics.Stopwatch stopwatch2 = new System.Diagnostics.Stopwatch();

            stopwatch2.Start();

            int temp3 = 0;

            for (int i = 0; i < list.Count; i++)

            {

                temp3 += list[i];

            }

            stopwatch2.Stop();

            Debug.Log("for list.Count  time=: " + stopwatch2.Elapsed.TotalMilliseconds + "temp3:" + temp3);

            System.Diagnostics.Stopwatch stopwatch1 = new System.Diagnostics.Stopwatch();

            stopwatch1.Start();

            int temp2 = 0;

            foreach (var item in list)

            {

                temp2 += item;

            }

            stopwatch1.Stop();

            Debug.Log("foreach time=: " + stopwatch1.Elapsed.TotalMilliseconds + "temp2:" + temp2);

        }

    }

}

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