#include #ifdef _DEBUG #include "debug.hpp" #else #define debug(...) #endif #define fastIO (cin.tie(0), cout.tie(0), ios::sync_with_stdio(false)) #define rep(i, n) for (int i = 0; i < (n); ++i) #define precise(i) fixed << setprecision(i) using ill = int64_t; using ull = uint64_t; using namespace std; using std::cout; struct Piece { int x_, y_; Piece(int x, int y) : x_{x}, y_{y} {} void move(int x, int y) { x_ = x, y_ = y; } bool isPos(int x, int y) { return (x_ == x && y_ == y); } }; void solve() { Piece A(2, 8), B(3, 9), C(7, 9); int n; cin >> n; while (n--) { int cur_x, cur_y, x, y; cin >> cur_x >> cur_y >> x >> y; if (A.isPos(cur_x, cur_y)) A.move(x, y); else if (B.isPos(cur_x, cur_y)) B.move(x, y); else if (C.isPos(cur_x, cur_y)) C.move(x, y); } if ((A.isPos(5, 8) == true) && (B.isPos(4, 8) == true) && (C.isPos(6, 8))) { cout << "YES" << '\n'; } else { cout << "NO" << '\n'; } } void wrapper() { rep(i, 3) { cout << "[TEST " << i << "]\n"; solve(); cout << "\n"; } } int main() { fastIO; #ifdef _DEBUG wrapper(); #else solve(); #endif }