#define _CRT_SECURE_NO_WARNINGS #include "bits/stdc++.h" #include using namespace std; //呪文 #define DUMPOUT cerr #define dump(...) DUMPOUT<<" ";DUMPOUT<<#__VA_ARGS__<<" :["<<__LINE__<<":"<<__FUNCTION__<<"]"< pii; typedef pair pll; typedef pair pdd; typedef pair pss; template ostream& operator << (ostream& ostr, const pair<_KTy, _Ty>& m) { ostr << "{" << m.first << ", " << m.second << "}"; return ostr; } template ostream& operator << (ostream& ostr, const map<_KTy, _Ty>& m) { if (m.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *m.begin(); for (auto itr = ++m.begin(); itr != m.end(); itr++) { ostr << ", " << *itr; } ostr << "}"; return ostr; } template ostream& operator << (ostream& ostr, const vector<_Ty>& v) { if (v.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << v.front(); for (auto itr = ++v.begin(); itr != v.end(); itr++) { ostr << ", " << *itr; } ostr << "}"; return ostr; } template ostream& operator << (ostream& ostr, const set<_Ty>& s) { if (s.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << *(s.begin()); for (auto itr = ++s.begin(); itr != s.end(); itr++) { ostr << ", " << *itr; } ostr << "}"; return ostr; } template ostream& operator << (ostream& ostr, const stack<_Ty>& s) { if (s.empty()) { ostr << "{ }"; return ostr; } stack<_Ty> t(s); ostr << "{" << t.top(); t.pop(); while (!t.empty()) { ostr << ", " << t.top(); t.pop(); } ostr << "}"; return ostr; } template ostream& operator << (ostream& ostr, const list<_Ty>& l) { if (l.empty()) { ostr << "{ }"; return ostr; } ostr << "{" << l.front(); for (auto itr = ++l.begin(); itr != l.end(); ++itr) { ostr << ", " << *itr; } ostr << "}"; return ostr; } template istream& operator >> (istream& istr, pair<_KTy, _Ty>& m) { istr >> m.first >> m.second; return istr; } template istream& operator >> (istream& istr, vector<_Ty>& v) { for (size_t i = 0; i < v.size(); i++) istr >> v[i]; return istr; } namespace aux { // print tuple template struct tp { static void print(ostream& os, const Ty& v) { os << get(v) << ", "; tp::print(os, v); } }; template struct tp { static void print(ostream& os, const Ty& value) { os << get(value); } }; } template ostream& operator<<(ostream& os, const tuple& t) { os << "{"; aux::tp, 0, sizeof...(Tys)-1>::print(os, t); os << "}"; return os; } template inline void Fill(A(&array)[N], const T &val) { std::fill((T*)array, (T*)(array + N), val); } void dump_func() { DUMPOUT << endl; } template void dump_func(Head&& head, Tail&&... tail) { DUMPOUT << head; if (sizeof...(Tail) == 0) { DUMPOUT << " "; } else { DUMPOUT << ", "; } dump_func(std::move(tail)...); } #define PI 3.14159265358979323846 #define EPS 1e-11 #define FOR(i,a,b) for(int i=(a);i<(b);++i) #define REP(i,n) FOR(i,0,n) #define all(x) (x).begin(), (x).end() #define SZ(x) ((int)(x).size()) #define fake false template using State = pair; template using Queue = priority_queue, vector>, greater>>; template vector dijkstra(vector>> G, int s) { vector dist(G.size(), T(1) << 28); vector used(G.size(), false); Queue q; q.push(State(T(0), s)); //q.emplace(T(0), s); while (!q.empty()) { T c; int pos; tie(c, pos) = q.top(); q.pop(); if (used[pos]) continue; used[pos] = true; dist[pos] = c; for (State e : G[pos]) { if (dist[e.second] <= c + e.first) continue; q.push(State(c + e.first, e.second)); } } return dist; } int main() { //clock_t start, end; //start = clock(); cin.tie(0); ios::sync_with_stdio(false); int N, V, Ox, Oy; cin >> N >> V >> Ox >> Oy; bool oasis = (Ox == 0 && Oy == 0 ? false : true); Ox--; Oy--; vector> L(N, vector(N)); cin >> L; vector> G(N * N); for (int i = 0; i < N - 1; i++) { int v, ni, nj, nv; for (int j = 0; j < N - 1; j++) { v = i * N + j; ni = i; nj = j + 1; nv = ni * N + nj; G[v].push_back(pii(L[ni][nj], nv)); G[nv].push_back(pii(L[i][j], v)); ni = i + 1; nj = j; nv = ni * N + nj; G[v].push_back(pii(L[ni][nj], nv)); G[nv].push_back(pii(L[i][j], v)); } v = i * N + N - 1; nv = (i + 1) * N + N - 1; G[v].push_back(pii(L[i + 1][N - 1], nv)); G[nv].push_back(pii(L[i][N - 1], v)); v = (N - 1) * N + i; nv = (N - 1) * N + i + 1; G[v].push_back(pii(L[N - 1][i + 1], nv)); G[nv].push_back(pii(L[N - 1][i], v)); } int s_to_g, s_to_o, o_to_g; s_to_g = dijkstra(G, 0)[N * N - 1]; if (oasis) { s_to_o = dijkstra(G, 0)[Oy * N + Ox]; o_to_g = dijkstra(G, Oy * N + Ox)[N * N - 1]; } if (s_to_g < V) cout << "YES" << endl; else if (oasis && V - s_to_o > 0 && (V - s_to_o) * 2 > o_to_g) cout << "YES" << endl; else cout << "NO" << endl; //end = clock(); //printf("%d msec.\n", end - start); return 0; }