丧心病狂工科女

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805495863296000 A reversible prime in any number system is a prime whose "reverse" in th 阅读全文

摘要： https://pintia.cn/problem-sets/994805342720868352/problems/994805523835109376 As an emergency rescue team leader of a city, you are given a special ma 阅读全文