约瑟夫环：　已知n个人（以编号1，2，3...n分别表示）围坐在一张圆桌周围。从编号为k的人开始报数，数到m的那个人出列；他的下一个人又从1开始报数，数到m的那个人又出列；依此规律重复下去，直到圆桌周围的人全部出列。 -Joseph Central: Given n individuals (with numbers 1,2,3 ... n, respectively) sitting around a round table around. From the number of people began to report the number of k and count the man out of the column m　his newspaper the next person and from a starting number, count m the man was out of line　and so Law repeated until the round table around were all the columns