General announcement

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Unfortunately, it has been discovered that there is an issue with problem D in the author's solutions. It will be fixed soon and all submissions will be retested. Due to this fact and technical difficulties, we are forced to declare the round as NON-RATED. We apologize for the inconvenience. Please try to enjoy just solving the problems, as it is what we all love to do.

不幸的是，已经发现作者的解决方案中的问题D有问题。它将很快被修复，所有提交的问题都将被重新测试。由于这一事实和技术上的困难，我们被迫宣布本轮比赛为非评级。我们对造成的不便表示歉意。请尽量享受解决问题的乐趣，因为这是我们都喜欢做的事情。

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