Problems
| Problem |
|---|
| A 组队 （team） 1000ms 256MiB Submit |
| B 卡牌 1000ms 256MiB Submit |
| C 午饭 （lunch） 1000ms 256MiB Submit |
| D 集合 （set） 2000ms 512MiB Submit |
Submissions
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Contest Clarifications
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