/* -*- coding: utf-8 -*- * * 228.cc: No.228 ゆきこちゃんの 15 パズル - yukicoder */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include using namespace std; /* constant */ const int dxs[] = {1, 0, -1, 0}, dys[] = {0, -1, 0, 1}; /* typedef */ typedef unsigned long long ull; typedef pair puli; /* global variables */ /* subroutines */ /* main */ int main() { ull st = 0, gl = 0; for (int i = 0; i < 15; i++) st |= ((ull)(i + 1) << (i * 4)); for (int i = 0; i < 16; i++) { ull ai; cin >> ai; gl |= (ai << (i * 4)); } //printf("st=%016llx, gl=%016llx\n", st, gl); queue q; q.push(puli(st, 0)); bool ok = false; while (! q.empty()) { puli u = q.front(); q.pop(); ull &ubits = u.first; int &umask = u.second; if (ubits == gl) { ok = true; break; } int upos; for (upos = 0; upos < 16; upos++) if (((ubits >> (upos * 4)) & 0xf) == 0) break; int ux = upos % 4, uy = upos / 4; for (int di = 0; di < 4; di++) { int vx = ux + dxs[di], vy = uy + dys[di]; if (vx >= 0 && vy < 4 && vy >= 0 && vy < 4) { int vpos = vy * 4 + vx; int vi = (ubits >> (vpos * 4)) & 0xf; if (! (umask & (1 << vi))) { int vmask = umask | (1 << vi); ull vbits = (ubits & ~(0xfULL << (vpos * 4))) | ((ull)vi << (upos * 4)); q.push(puli(vbits, vmask)); } } } } cout << (ok ? "Yes" : "No") << endl; return 0; }