http://acm.hdu.edu.cn/showproblem.php?pid=2062 Subset sequence Time Limit: 1000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 3569    Accepted Submission(s): 1802 Problem Description Consider the aggregate An=…

题目链接 Problem Description Consider the aggregate An= { 1, 2, -, n }. For example, A1={1}, A3={1,2,3}. A subset sequence is defined as a array of a non-empty subset. Sort all the subset sequece of An in lexicography order. Your task is to find the m-th…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=2062 Problem Description 考虑集合An = {1,2,...,n}. 例如,A1 = {1},A3 = {1,2,3}. 子集序列被定义为非空子集的数组. 按照字典顺序排列An的所有子集. 你的任务是找到第m个. Input 输入包含多个测试用例. 每个测试用例由两个数字n和m组成(0 <n <= 20,0 <m <= An的子集序列总数). Output 对于每个…

我是把它当做一道数学题来做的. 这篇题解写的有点啰嗦,但是是我最原始的思维过程. 对于一个集合An= { 1, 2, …, n },在n比较小的情况下,在纸上按字典顺序把所有子集排列一下. 以n=3,m=10举例: n=3的情况 容易看出前5个打头的是1,紧接着5个子集打头的是2,最后5个开头的是3. 拿前五个来说,除了第一个,后面四个不看开头的1,后面的排列形式和n=2的子集的排列很相似. f(n)代表集合An所有子集的个数,那么有递推关系: f(n) = n * (f(n - 1) + 1)…

意甲冠军:查找集合{1,2,3...n}第一m一个排列子. 收集的线索所行的大小. 例两个元素的排列子集合按字典树排列是:{1},{1,2},{2},{2,1}: 解法:一个一个元素来确定,每次把剩余的元素按大小顺序排列在num中,然后依据排列组合原理直接计算下一个位置的元素的大小.直到排列数为0停止: 代码: /****************************************************** * author:xiefubao *******************…

这道题目非常好,饶了点儿圈子.我的思路是,先按照组排列.例如,1            2           31 2         2 1        3 11 2 3      2 1 3     3 1 21 3         2 3        3 21 3 2      2 3 1     3 2 1分成3组,每组个数是确定的,因此可以通过m/组数获得第一个数字,然后组数因n--而减小.重新计算属于哪一组,但此时需要考虑printf的数字,因此使用visit数组保证每个数字仅…

Subset sequence Time Limit: 1000/1000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) Total Submission(s): 8188 Accepted Submission(s): 3735 Problem Description Consider the aggregate An= { 1, 2, -, n }. For example, A1={1}, A3={1,2,3}. A…

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HDU 1711 Number Sequence(数列) Time Limit: 10000/5000 MS (Java/Others) Memory Limit: 32768/32768 K (Java/Others) [Description] [题目描述] Given two sequences of numbers : a[1], a[2], ...... , a[N], and b[1], b[2], ...... , b[M] (1 <= M <= 10000, 1 <= N…

HDU 1005 Number Sequence(数列) Time Limit: 2000/1000 MS (Java/Others) Memory Limit: 65536/32768 K (Java/Others) [Description] [题目描述] 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, an…