using System; using System.Diagnostics; using System.Collections.Generic; using System.Linq; using Enu = System.Linq.Enumerable; class Solution { int N, V, Ox, Oy; int[,] L; int[, ,] visited; int[] dx = { 1, 0, -1, 0 }, dy = { 0, 1, 0, -1 }; void calc() { rio(out N, out V, out Ox, out Oy); Ox--; Oy--; L = new int[N, N]; for(int i = 0; i < N; i++) { var r = ria(N); for(int j = 0; j < N; j++) { L[i, j] = r[j]; } } visited = new int[N, N, 2]; for(int i = 0; i < N; i++) for(int j = 0; j < N; j++) for(int k = 0; k < 2; k++) visited[i, j, k] = -1; Console.WriteLine(check() ? "YES" : "NO"); } bool check() { var q = new PriorityQueue((s1, s2) => s1.v.CompareTo(s2.v)); q.Push(new state(0, 0, V, true)); while(q.Count() != 0) { var s = q.Pop(); if(s.v <= 0) continue; if(s.x == N - 1 && s.y == N - 1) { return true; } if(s.x == Ox && s.y == Oy && s.o) { s.v *= 2; s.o = false; } if(s.o) { if(s.v <= visited[s.y, s.x, 1]) continue; visited[s.y, s.x, 1] = s.v; } else { if(s.v <= visited[s.y, s.x, 0]) continue; visited[s.y, s.x, 0] = s.v; } for(int i = 0; i < 4; i++) { int nx = s.x + dx[i], ny = s.y + dy[i]; if(!L.InRange(ny, nx)) continue; q.Push(new state(nx, ny, s.v - L[ny, nx], s.o)); } } return false; } public class PriorityQueue { private List buffer; private Comparison comp; // 昇順 // (e1, e2) => e2.CompareTo(e1) // 降順 // (e1, e2) => e1.CompareTo(e2) public PriorityQueue(Comparison comp) { buffer = new List(); this.comp = comp; } public PriorityQueue(Comparison comp, IEnumerable data) : this(comp) { foreach(T e in data) Push(e); } public void Push(T elem) { PushHeap(this.buffer, elem); } public T Pop() { return PopHeap(this.buffer); } public int Count() { return buffer.Count; } public T Top() { return buffer[0]; } private void PushHeap(List array, T elem) { int n = array.Count; array.Add(elem); while(n != 0) { int i = (n - 1) / 2; // 親と値を入れ替え if(comp(array[n], array[i]) > 0) { T tmp = array[n]; array[n] = array[i]; array[i] = tmp; } n = i; } } private T PopHeap(List array) { int n = array.Count - 1; T returnelem = array[0]; array[0] = array[n]; array.RemoveAt(n); for(int i = 0, j; (j = 2 * i + 1) < n; ) { // 値の大きい方の子を選ぶ if((j != n - 1) && (comp(array[j], array[j + 1]) < 0)) j++; // 子と値を入れ替え if(comp(array[i], array[j]) < 0) { T tmp = array[j]; array[j] = array[i]; array[i] = tmp; } i = j; } return returnelem; } } class state { public int x, y, v; public bool o; public state(int x, int y, int v, bool o) { this.x = x; this.y = y; this.v = v; this.o = o; } } static void Main(string[] args) { new Solution().calc(); } #region static int ri() { return int.Parse(Console.ReadLine()); } static int[] ria(int n) { if(n <= 0) { Console.ReadLine(); return new int[0]; } else return Console.ReadLine().Trim().Split(' ').Select(int.Parse).ToArray(); } static void rio(out int p1) { p1 = ri(); } static void rio(out int p1, out int p2) { var r = ria(2); p1 = r[0]; p2 = r[1]; } static void rio(out int p1, out int p2, out int p3) { var r = ria(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; } static void rio(out int p1, out int p2, out int p3, out int p4) { var r = ria(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; } static void rio(out int p1, out int p2, out int p3, out int p4, out int p5) { var r = ria(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; } static long rl() { return long.Parse(Console.ReadLine()); } static long[] rla(int n) { if(n <= 0) { Console.ReadLine(); return new long[0]; } else return Console.ReadLine().Trim().Split(' ').Select(long.Parse).ToArray(); } static void rlo(out long p1) { p1 = rl(); } static void rlo(out long p1, out long p2) { var r = rla(2); p1 = r[0]; p2 = r[1]; } static void rlo(out long p1, out long p2, out long p3) { var r = rla(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; } static void rlo(out long p1, out long p2, out long p3, out long p4) { var r = rla(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; } static void rlo(out long p1, out long p2, out long p3, out long p4, out long p5) { var r = rla(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; } static double rd() { return double.Parse(Console.ReadLine()); } static double[] rda(int n) { if(n <= 0) { Console.ReadLine(); return new double[0]; } else return Console.ReadLine().Trim().Split(' ').Select(double.Parse).ToArray(); } static void rdo(out double p1) { p1 = rd(); } static void rdo(out double p1, out double p2) { var r = rda(2); p1 = r[0]; p2 = r[1]; } static void rdo(out double p1, out double p2, out double p3) { var r = rda(3); p1 = r[0]; p2 = r[1]; p3 = r[2]; } static void rdo(out double p1, out double p2, out double p3, out double p4) { var r = rda(4); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; } static void rdo(out double p1, out double p2, out double p3, out double p4, out double p5) { var r = rda(5); p1 = r[0]; p2 = r[1]; p3 = r[2]; p4 = r[3]; p5 = r[4]; } static void swap(ref T x, ref T y) { T temp = x; x = y; y = temp; } static void wa1(T[] a) { Debug.WriteLine(string.Join(" ", a)); } static void wa2(T[][] a) { foreach(var row in a) { Debug.WriteLine(String.Join(" ", row)); } } [DebuggerDisplay("{x} , {y}")] class point { public int x, y; public point(int x, int y) { this.x = x; this.y = y; } } #endregion } static class Extention { public static T[][] ToJagArray(this T[,] a) { int n = a.GetLength(0), m = a.GetLength(1); var ret = new T[n][]; for(int i = 0; i < n; i++) { ret[i] = new T[m]; for(int j = 0; j < m; j++) { ret[i][j] = a[i, j]; } } return ret; } public static bool InRange(this T[,] a, int i, int j) { int n = a.GetLength(0), m = a.GetLength(1); return 0 <= i && i < n && 0 <= j && j < m; } }