hdu 5312 Sequence（数学推导——三角形数）

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hdu 5312 Sequence（数学推导——三角形数）

题目链接:http://acm.hdu.edu.cn/showproblem.php?pid=5312 Sequence Time Limit: 2000/2000 MS (Java/Others) Memory Limit: 262144/262144 K (Java/Others) Total Submission(s): 1336 Accepted Submission(s): 410 Problem Description Today, Soda has learned a…

HDU 5312 Sequence (规律题)

题意: 一个序列的第n项为3*n*(n-1)+1,而 n>=1,现在给一个正整数m,问其最少由多少个序列中的数组成? 思路: 首先,序列第1项是1,所以任何数都能构成了.但是最少应该是多少?对式子进行变形,6*(n*(n-1)/2)+1,看到了三角形数n*(n-1)/2,那么应该是6*(任意自然数)+x=m才对,因为最多只要3个三角形数就能组成任何自然数啦. 不妨试试m%6是多少?这样试图求x可以吗?因为任意自然数最多由3个组成,如果是k个,那么应该x>=k,别忘了还有个+1的项.x-k那部分…

hdu 5312 Sequence（数学推导+线性探查（两数相加版））

Problem Description Today, Soda has learned a sequence whose n-th (n≥) item )+. Now he wants to know if an integer m can be represented as the sum of some items of that sequence. If possible, what are the minimum items needed? For example, =+++=+++.…

hdu.5211.Mutiple(数学推导 && 在logn的时间内求一个数的所有因子）

Mutiple Accepts: 476 Submissions: 1025 Time Limit: 4000/2000 MS (Java/Others) Memory Limit: 65536/65536 K (Java/Others) 问题描述 wld有一个序列a[1..n], 对于每个1≤i<n, 他希望你求出一个最小的j(以后用记号F(i)表示),满足i<j≤n, 使aj为ai的倍数(即aj mod ai＝0),若不存在这样的j,那么此时令F(i) = 0 保证1≤n≤1000…

HDU 5734 Acperience(数学推导)

Problem Description Deep neural networks (DNN) have shown significant improvements in several application domains including computer vision and speech recognition. In computer vision, a particular type of DNN, known as Convolutional Neural Networks (…

HDU 5984 题解数学推导期望

Let’s talking about something of eating a pocky. Here is a Decorer Pocky, with colorful decorative stripes in the coating, of length L. While the length of remaining pocky is longer than d, we perform the following procedure. We break the pocky at an…