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…

题意:给定正整数n和r.定义Y数列为从正整数序列中删除全部能表示成a^b(2 ≤ b ≤ r)的数后的数列,求Y数列的第n个数是多少. 比如n = 10. r = 3,则Y数列为2 3 5 6 7 10 11 12 13 14,第10个数是14. 非常有趣的一道数论题.题目给出的范围是long long范围的. 所以显然不用去枚举每一个数了,更不用说推断每一个数是不是某个数的某次方.那么这个题怎么下手呢.首先我们能够非常直观的想到,被删去的数显然是非常分散的.由于能表示成某个数的幂这种形式的数非…

Y sequence 题目连接: http://acm.hdu.edu.cn/showproblem.php?pid=5297 Description Yellowstar likes integers so much that he listed all positive integers in ascending order,but he hates those numbers which can be written as a^b (a, b are positive integers,2…

Yellowstar likes integers so much that he listed all positive integers in ascending order,but he hates those numbers which can be written as a^b (a, b are positive integers,2<=b<=r),so he removed them all.Yellowstar calls the sequence that formed by…

Y sequence Problem's Link: http://acm.hdu.edu.cn/showproblem.php?pid=5297 Mean: 有连续数列A={1,2,3,4,5,6,7,8 .....},将可以表示成a^b次方的数删除,a={1,2,3,4,5...},而2<=b<=r,删除后形成一个新的数列,求这个数列的第n项. analyse: 很有趣的一道数论题. 对于给定的一个n,如果我们知道1~n中被删除的数字为k个,那么答案一定大于等于n+k,所以向后至少移动k个…

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5297 题意:给你一个所有正整数的序列,然后去掉满足x^(2~r)的所有数(x为所有正整数,r>=2题目给出),问你现在这个序列的第n个数是什么 解:首先想到写一个函数func(y),它可以计算出给定数字y是序列中第几个数,这样我们大概可以二分答案~(事实上会TLE,得用迭代法,当然迭代的话也是用这个函数) 那么如何实现func: 首先想去掉满足x^2的所有数,我们可以用pow(y, 1/2)计算出y…

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Y sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 667    Accepted Submission(s): 147 Problem Description Yellowstar likes integers so much that he listed all positive integers in ascend…

Recursive sequence Time Limit: 2000/1000 MS (Java/Others)    Memory Limit: 65536/65536 K (Java/Others)Total Submission(s): 249    Accepted Submission(s): 140 Problem Description Farmer John likes to play mathematics games with his N cows. Recently, t…