摘要：
It's a sunny day with good scenery, and you come to the park for a walk. You feel curious that there are many old guys gathering by a bridge, and want 阅读全文
摘要：
Alduhmellah and Behlah both like large numbers, lots of numbers and lots of large numbers. They also like to do calculations on those numbers. One day 阅读全文
摘要：
Yen-Jen loves cat very much. Now, there are 10^{18}1018 cats standing in a line, the i^ith cat's cost value c_ic**i is equal to ii, the i^ith cat's in 阅读全文
摘要：
有公式： \(num = \lfloor \frac{x}{p} \rfloor + \lfloor \frac{x}{p^2} \rfloor + \lfloor \frac{x}{p^3} \rfloor + ....\) $\lfloor \frac{pk} \rfloor$相当于1到n中$p 阅读全文
摘要：
给你一个整数数组 perm ，它是前 n 个正整数的排列，且 n 是个 奇数 。 它被加密成另一个长度为 n - 1 的整数数组 encoded ，满足 encoded[i] = perm[i] XOR perm[i + 1] 。比方说，如果 perm = [1,3,2] ，那么 encoded = 阅读全文
摘要：
ABC Conjecture Time limit: 3 seconds Figure 1: Shinichi Mochizuki The ABC conjecture (also known as the Oesterle–Masser conjec- ´ ture) is a famous co 阅读全文