How Can I reduce speed of one player and increase speed of another player when it comes closer to one another?

Question

Here, in my code using Microsoft visual studio in C# for game development to detect Collision. I wrote the script to find shortest path of the player using the A* algorithm. In this script, I am unable to detect collision between different players.I want to reduce the speed of one player and increase the speed of another player using different tags. But I am unable to handle the speed of the player.

Here is my code

using System.Collections;
using System.Collections.Generic;
using UnityEngine.UI;
using UnityEngine;
public class PathfindingTester : MonoBehaviour
{
    // The A* manager.
    private AStarManager AStarManager = new AStarManager();
    // Array of possible waypoints.
    List<GameObject> Waypoints = new List<GameObject>();
    // Array of waypoint map connections. Represents a path.
    List<Connection> ConnectionArray = new List<Connection>();
    // The start and end target point.
    public GameObject start;
    public GameObject end;
    // Debug line offset.
    Vector3 OffSet = new Vector3(0, 0.3f, 0);
    public float speed;
    private Rigidbody rb;
    private Transform target;
    int current;
    //float WPradius = 0.5f;
    Connection aConnection;
    public Text countText;
    private int countit;
    //public GameObject[] targets;

    // Start is called before the first frame update
    void Start()
    {
        if (start == null || end == null)
        {
            Debug.Log("No start or end waypoints.");
            return;
        }

        // Find all the waypoints in the level.
        GameObject[] GameObjectsWithWaypointTag;
        GameObjectsWithWaypointTag = GameObject.FindGameObjectsWithTag("Waypoint");

        foreach (GameObject waypoint in GameObjectsWithWaypointTag)
        {
            WaypointCON tmpWaypointCon = waypoint.GetComponent<WaypointCON>();
            if (tmpWaypointCon)
            {
                Waypoints.Add(waypoint);
            }
        }

        // Go through the waypoints and create connections.
        foreach (GameObject waypoint in Waypoints)
        {
            WaypointCON tmpWaypointCon = waypoint.GetComponent<WaypointCON>();
            // Loop through a waypoints connections.
            foreach (GameObject WaypointConNode in tmpWaypointCon.Connections)
            {
                Connection aConnection = new Connection();
                aConnection.SetFromNode(waypoint);
                aConnection.SetToNode(WaypointConNode);
                AStarManager.AddConnection(aConnection);
            }
        }

        // Run A Star...
        ConnectionArray = AStarManager.PathfindAStar(start, end);
        //  Debug.Log(ConnectionArray.Count);
        // rb = GetComponent<Rigidbody>();
        //rb.MovePosition((ConnectionArray[0].GetFromNode().transform.position + OffSet));
        //transform.position = ConnectionArray[0].GetFromNode().transform.position;
        countit = 0;
        countText.text = "Count: " + countit;
        /*countTextTwo.text = "Counttwo:" + countit;
        countTextThree.text = "Countthree:" + countit;*/
    }

    // Draws debug objects in the editor and during editor play (if option set).
    void OnDrawGizmos()
    {
        // Draw path.
        foreach (Connection aConnection in ConnectionArray)
        {
            Gizmos.color = Color.red;
            Gizmos.DrawLine((aConnection.GetFromNode().transform.position + OffSet),
             (aConnection.GetToNode().transform.position + OffSet));
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (transform.position != ConnectionArray[current].GetToNode().transform.position)
        {
            Vector3 pos2 = Vector3.MoveTowards(transform.position, ConnectionArray[current].GetToNode().transform.position, speed * Time.deltaTime);
            var LookPos = ConnectionArray[current].GetToNode().transform.position - transform.position;
            LookPos.y = 0;
            transform.rotation = Quaternion.Slerp(transform.rotation, Quaternion.LookRotation(LookPos), 1);
            GetComponent<Rigidbody>().MovePosition(pos2);
            //Debug.Log(transform.position);
        }
        else
        {
            current = (current + 1) % ((ConnectionArray.Count));
            // if (current + 2 == (ConnectionArray.Count - 1) && (transform.position != ConnectionArray[current].GetToNode().transform.position))
            if (current + (ConnectionArray.Count - 1) == (ConnectionArray.Count - 1) && (transform.position != ConnectionArray[current].GetToNode().transform.position))
            {
                if ((transform.position != ConnectionArray[(current + (ConnectionArray.Count - 1))].GetFromNode().transform.position))
                {
                    countit = countit + 1;
                    countText.text = "Count:" + countit;
                    /*countTextTwo.text = "Counttwo:" + countit;
                    countTextThree.text = "Countthree:" + countit;*/
                    speed = speed - 1 f;
                }
                ConnectionArray.Reverse();
                Vector3 pos3 = Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed * Time.deltaTime);
                GetComponent<Rigidbody>().MovePosition(pos3);
                if (countit == 10)
                {
                    speed = 0f;
                }
            }
            else
            {
                {
                    current = (current) % ((ConnectionArray.Count));
                }
            }
        }
    }

    void OnTriggerEnter(Collider other)
    {
        if (other.gameObject.CompareTag("target"))
        {
            other.gameObject.SetActive(true);
            countit = countit + 1;
            countText.text = "Count: " + countit;
        }

        if (other.gameObject.CompareTag("playerfirstspeed"))
        {
            other.gameObject.SetActive(true);
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed * Time.deltaTime);
        }

        if (other.gameObject.CompareTag("playersecondspeed"))
        {
            other.gameObject.SetActive(true);
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed * Time.deltaTime);
        }

        if (other.gameObject.CompareTag("playerthirdspeed"))
        {
            other.gameObject.SetActive(true);
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed * Time.deltaTime);
        }
    }

    void OnTriggerExit(Collider other)
    {
        if (other.gameObject.CompareTag("target"))
        {
            other.gameObject.SetActive(false);
        }

        if (other.gameObject.CompareTag("playerfirstspeed"))
        {
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed - 2);
        }

        if (other.gameObject.CompareTag("playersecondspeed"))
        {
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed - 2);
        }

        if (other.gameObject.CompareTag("playerthirdspeed"))
        {
            Vector3.MoveTowards(transform.position, ConnectionArray[current].GetFromNode().transform.position, speed - 2);
        }
    }
}

Answer 1

As im understand u have only one variable "speed" for all of three players.

Hows about to declare "speed" variable for each player, then check certain raduis for collisions with other players, get other players by collision and make addition or substraction for them?