POJ 2853 Sequence Sum Possibilities

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POJ 2853 Sequence Sum Possibilities

Sequence Sum Possibilities Time Limit: 1000MS Memory Limit: 65536K Total Submissions: 5537 Accepted: 3641 Description Most positive integers may be written as a sum of a sequence of at least two consecutive positive integers. For instance, 6 = 1…

Poj 2853,2140 Sequence Sum Possibilities(因式分解)

一.Description Most positive integers may be written as a sum of a sequence of at least two consecutive positive integers. For instance, 6 = 1 + 2 + 3 9 = 5 + 4 = 2 + 3 + 4 but 8 cannot be so written. Write a program which will compute how many differ…

[POJ 3581]Sequence

[POJ 3581]Sequence 标签: 后缀数组题目链接题意给你一串序列$A_i$,保证对于$ \forall i \in [2,n],都有A_1 >A_i$. 现在需要把这个序列分成三段,并且将这三段分别翻转,求如何翻转使整个序列字典序最小.(每一段不能为空) 题解首先可以确定第一段的位置. 注意到,$A_1$是最大的,所以我们就只用考虑怎样找到一个前缀使其翻转后的字典序最小. (假如不是的话,就可能找到两个前缀翻转之后,一个为另一个的前缀,无法解决) 这等价于翻转之后找…

Ural 1248 Sequence Sum 题解

目录 Ural 1248 Sequence Sum 题解题意题解程序 Ural 1248 Sequence Sum 题解题意给定$n$个用科学计数法表示的实数$(10^{-100}\sim10^{100})$,输出它们的和. Tip: 一个实数可以用科学计数法表示为$x\times10^y$,其中$1\le x<10$ $x$为实数,$y$是整数.输入时表示为$xey$.保证输入的实数有$19$位有效数字.输出时用科学计数法,必须包括$19$位正确数…

POJ 2479 Maximum sum POJ 2593 Max Sequence

d(A) = max{sum(a[s1]..a[t1]) + sum(a[s2]..a[t2]) | 1<=s1<=t1<s2<=t2<=n} 即求两个子序列和的和的最大值. 为单个区间子序列和的最大值的变形. 左边的从左向右扫描,而右边的从右向左扫描即可. #include<cstdio> #include<algorithm> using namespace std; const int MAXN=50000+10; int left[MAXN],…

POJ 2442 Sequence

Pro. 1 给定k个有序表,取其中前n小的数字.组成一个新表,求该表? 算法: 由于 a1[1] < a1[2] < a1[3] ... <a1[n] a2[1] < a2[2] < a2[3] ... < a2[n] ......... ak[1] < ak[2]<ak[3]...... < ak[n] 首先每个有序表的第一个元素入堆,然后最小元素出堆.该元素入新表L,相应线性表的下一个元素入堆. 例如:如果出堆得是a2[2],那么a2[3]入堆…

POJ 2442 - Sequence - [小顶堆][优先队列]

题目链接:http://poj.org/problem?id=2442 Time Limit: 6000MS Memory Limit: 65536K Description Given m sequences, each contains n non-negative integer. Now we may select one number from each sequence to form a sequence with m integers. It's clear that we ma…