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Time Limit: 2 s
Memory Limit: 256 MB
Total points: 100
#339. 侦查守卫
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Custom Test
The problem was used in the following contests:
2016 上海市代表队选拔赛 (SHOI 2016) Day 1
2016 吉林省队选拔赛 (JLOI 2016) Day 1
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