Problem:
Score : 200 points

Problem Statement

Two children are playing tag on a number line. (In the game of tag, the child called "it" tries to catch the other child.) The child who is "it" is now at coordinate A, and he can travel the distance of V per second.
The other child is now at coordinate B, and she can travel the distance of W per second.

He can catch her when his coordinate is the same as hers.
Determine whether he can catch her within T seconds (including exactly T seconds later).
We assume that both children move optimally.

Constraints

-10^9 \leq A,B \leq 10^9

1 \leq V,W \leq 10^9

1 \leq T \leq 10^9

A \neq B

All values in input are integers.

Input

Input is given from Standard Input in the following format:

A V
B W
T

Output

If "it" can catch the other child, print YES; otherwise, print NO.

Sample Input 1

1 2
3 1
3

Sample Output 1

YES

Sample Input 2

1 2
3 2
3

Sample Output 2

NO

Sample Input 3

1 2
3 3
3

Sample Output 3

NO

Solution in C# (.NET Core 3.1.201) (judge verdict: Wrong Answer)

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection.Metadata;
using System.Threading;

namespace ForATCODER
{
    public class Program
    {
        ///template
        ///
        /// String[] s = Console.ReadLine().Split(' ');
        ///   long[] nk =  s2larray(Console.ReadLine().Split(' '));
        ///  

        public static void Main(string[] args)
        {

             long[] av = s2larray(Console.ReadLine().Split(' '));
            av[0] += 1000000000L;
            long[] bw = s2larray(Console.ReadLine().Split(' '));
            bw[0] += 1000000000L;
            long t = s2l(Console.ReadLine());
            int count = 0;
            long k1 = av[1] - bw[1];
            long k2 = bw[0] - av[0];
            if (av[0] > bw[0])
            {
                k2 *= -1;
            }
            if (k1 < 0)
            {
                k1 *= -1;
                k2 *= -1;
            }
            if(k1 <= 0 || k2 <=0)
            {
                RESULT("NO");
                return;
            }
            else
            {
                k2 /= k1;
                if(k2 > t || k2 < 0)
                {
                    RESULT("NO");
                    return;
                }
                RESULT("YES");
                return;
            }

        }

        /// <summary>
        /// Original Tree Class
        /// </summary>
        /// <typeparam name="T"></typeparam>
        class TreeNode<T>
        {
            List<TreeNode<T>> Children;

            T Item { get; set; }

            public TreeNode(T item)
            {
                Item = item;
            }

            public TreeNode<T> AddChild(T item)
            {
                TreeNode<T> nodeItem = new TreeNode<T>(item);
                Children.Add(nodeItem);
                return nodeItem;
            }
            public void AddChildRelative(TreeNode<T> item)
            {
                Children.Add(item);
            }
            public List<TreeNode<T>> GetChildren(T val)
            {
                if (val.Equals(Item))
                {
                    var l = new List<TreeNode<T>>();
                    l.Add(this);
                    return l;
                }
                return Children.FindAll(x => x.Item.Equals(val));
            }
        }

        static void addarray(long[] arr, int start, int end)
        {
            for (int i = start; i <= end; i++)
            {
                arr[i]++;
            }
        }
        public static decimal Sqrt(decimal x)
        {
            decimal sqrt_x = (decimal)Math.Sqrt((long)x);
            for (int i = 0; i < 10; ++i)
                sqrt_x = 0.5m * (sqrt_x + x / sqrt_x);
            return sqrt_x;
        }
        static long summ(long s)
        {
            if (s == 1) return 1;
            return s + summ(s - 1);
        }
        public static bool checka(int[] a, int m)
        {
            int back = 1;
            for (int i = 0; i < a.Length; i++)
            {
                if (a[i] >= 1 && a[i] <= m)
                {
                    if (a[i] >= back)
                    {
                        back = a[i];
                    }
                    else
                    {
                        return false;
                    }
                }
                else
                {
                    return false;
                }
            }
            return true;
        }
        public static ulong pow(int a, int b)
        {
            ulong res = 1;
            for (int i = 0; i < b; i++)
            {
                res *= (ulong)a;
            }
            return res;
        }
        static int s2i(String s)
        {
            return Convert.ToInt32(s);
        }
        static long s2l(String s)
        {
            return Convert.ToInt64(s);
        }
        static void RESULT(double res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(long res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(ulong res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(int res)
        {
            Console.WriteLine(res);
        }
        static void RESULT(String res)
        {
            Console.WriteLine(res);
        }
        static String[] ReadLineAll(int count)
        {
            String[] res = new String[count];
            for (int i = 0; i < count; i++)
            {
                res[i] = Console.ReadLine();
            }
            return res;
        }

        static int[] s2iarray(String[] src)
        {
            int len = src.Length;
            int[] res = new int[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToInt32(src[i]);
            }
            return res;
        }
        static long[] s2larray(String[] src)
        {
            int len = src.Length;
            long[] res = new long[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToInt64(src[i]);
            }
            return res;
        }
        static decimal[] s2darray(String[] src)
        {
            int len = src.Length;
            decimal[] res = new decimal[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToDecimal(src[i]);
            }
            return res;
        }
        static ulong[] s2larray2(String[] src)
        {
            int len = src.Length;
            ulong[] res = new ulong[len];
            for (int i = 0; i < len; i++)
            {
                res[i] = Convert.ToUInt64(src[i]);
            }
            return res;
        }

        static long C(int n, int r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            long ans = 1;
            int i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }
        static long C(long n, long r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            long ans = 1;
            int i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }
        static ulong C(ulong n, ulong r)
        {
            if (n <= 1) return 0;
            if (r > n - r) r = n - r; // because C(n, r) == C(n, n - r)
            ulong ans = 1;
            ulong i;

            for (i = 1; i <= r; i++)
            {
                ans *= n - r + i;
                ans /= i;
            }

            return ans;
        }


    }

}