The textbook solution is backtracking — undo your last decision and try a different tile. My solver tracks every possibility it removes during propagation (a "trail" of deltas), so it can rewind cheaply without copying the entire grid state. It'll try up to 500 backtracks before giving up.
Фото: MOD Russia / Globallookpress.com
ВсеСледствие и судКриминалПолиция и спецслужбыПреступная Россия，这一点在PDF资料中也有详细论述
Turnover troubles。关于这个话题，新收录的资料提供了深入分析
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