Problems
| Problem |
|---|
| A 好数（number） 1000ms 256MiB Submit |
| B SOS字符串（sos） 1000ms 256MiB Submit |
| C 集训营的气球（balloon） 1000ms 256MiB Submit |
| D 连通子树与树的重心（tree） 1000ms 256MiB Submit |
Submissions
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Contest Clarifications
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