Be careful: there is 50 points penalty for submission which fails the pretests or resubmission (except failure on the first test, denial of judgement or similar verdicts). "Passed pretests" submission verdict doesn't guarantee that the solution is absolutely correct and it will pass system tests.
注意：未通过预测试或重新提交的提交将被罚50分（第一次测试失败、拒绝判断或类似裁决除外）。“通过预测试”提交的裁决并不能保证解决方案是绝对正确的，它将通过系统测试。
这是什么赛制？
提交后显示Pretests Passed(3) ，什么意思？