Reversible
PAT_A1015 Reversible Primes
A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re ......
PAT 甲级【1015 Reversible Primes】
考察素数判断 考察进制转换 import java.io.IOException; import java.io.InputStreamReader; import java.io.StreamTokenizer; public class Main { @SuppressWarnings("unc ......
时间可逆的马氏链(Time Reversible Markov Chain)
逆向过程 考虑一个具有转移概率$P_{ij}$和平稳概率$\pi_i$的已经达到平稳状态的遍历的(不可约+非周期+正常返)马尔科夫链。假设这个马氏链在平稳态的状态序列是${X_m,X_{m+1},\cdots}$, 现在我们沿时间的反方向来看这条链，具体地，我们希望考察 $P(X_m = j|X_{ ......
PAT 甲级 1015 Reversible Primes（20）
A reversible prime in any number system is a prime whose "reverse" in that number system is also a prime. For example in the decimal system 73 is a re ......