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引理 1. (a b) % c = ((a % c) (b % c)) % c. 2. &与运算，一般用于取位，如 a&1表示取a二进制下的个位 3. \ \ 位运算，表示右移，如\ \ 1表示除以2，比通常除法效率更高 4. $a^b = a^{b_0} a^{b_1 2} ... a^{b_n 阅读全文
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"原题链接" 问题描述 A number sequence is defined as follows: f(1) = 1, f(2) = 1, f(n) = (A f(n 1) + B f(n 2)) mod 7. Given A, B, and n, you are to calculate t 阅读全文
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问题描述 I have a very simple problem for you. Given two integers A and B, your job is to calculate the Sum of A + B. 输入描述 The first line of the input con 阅读全文