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。(Known n individuals (with numbers 1, 2, 3... N respectively) sitting around a round table around. K from a number of people start off, the man out of the line to the m; his next person and from 1 to start off, count to m that another person out;)