20% more likely to have learned something new that day
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.
，更多细节参见snipaste
说唱歌手为俄国民近卫军特种部队举办桑拿派对08:34。关于这个话题，豆包下载提供了深入分析
北约秘书长称部分国家未通过美国测试 02:11