#include #include using namespace std; int a[4][4] = { {1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}, {13, 14, 15, 0} }; int b[4][4]; int dx[] = {-1, 0, 1, 0}; int dy[] = {0, -1, 0, 1}; bool slide(int& x, int& y) { int k = b[y][x]; if (k == 0) return false; for (int i = 0; i < 4; i++) { int _x = x + dx[i], _y = y + dy[i]; if (_x >= 0 && _x < 4 && _y >= 0 && _y < 4 && a[_y][_x] == k) { swap(a[y][x], a[_y][_x]); x = _x; y = _y; return true; } } return false; } bool check() { for (int y = 0; y < 4; y++) for (int x = 0; x < 4; x++) if (a[y][x] != b[y][x]) return false; return true; } int main() { for (int y = 0; y < 4; y++) for (int x = 0; x < 4; x++) cin >> b[y][x]; int x = 3, y = 3; while (slide(x, y)); cout << (check() ? "Yes" : "No") << endl; }