Codeforces Round #603 (Div. 2)
A. Sweet Problem You have three piles of candies: red, green and blue candies: the fi ...
原文：Codeforces Round #603 (Div. 2) B. PIN Codes 水題
B. PIN Codes A PIN code is a string that consists of exactly digits. Examples of possible PIN codes: , and . Please note that the PIN code can begin with any digit, even with . Polycarp has n n bank c ...
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