变色失败 只加8分 距离变色只差5分 B题没想到那么简单，结论秒猜，不敢交，傻傻验证5分钟。
C题也想了码了好一会儿，我动态维护set做的。
1小时3题，整体难度好像没以前那么大了？(虽然也不强，但比以前好不少了......
难道是我变强了
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