官方测试数据中第 $8$ 个测试点与第 $11$ 个测试点不满足 $0 < c$，这两个测试点的数据被手动修正。
官方测试数据中第 $9$ 个测试点有误，这个测试点的数据被重新生成。
QOJ.ac
QOJ
Time Limit:
4 s
Memory Limit:
512 MB
Total points:
100
Hackable ✓
#3264. 相逢是问候
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