poj 2566Bound Found(前缀和,尺取法)】的更多相关文章

http://poj.org/problem?id=2566: Bound Found Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 2237   Accepted: 692   Special Judge Description Signals of most probably extra-terrestrial origin have been received and digitalized by The Aero…
http://poj.org/problem?id=3061 题目大意: 给定长度为n的整列整数a[0],a[1],--a[n-1],以及整数S,求出总和不小于S的连续子序列的长度的最小值. 思路: 方法一: 首先求出各项的和sum[i],这样可以在O(1)的时间内算出区间上的总和,这样,枚举每一个起点i,然后二分搜索出结果大于sum[i]+tot的最小下标.(tot是题目中的S) 总的时间为O(nlogn) 方法二: 设以a[s]开始的总和最初大于S时的连续子序列为a[s]+a[s+1]+--…
Description King George has recently decided that he would like to have a new design for the royal graveyard. The graveyard must consist of several sections, each of which must be a square of graves. All sections must have different number of graves.…
Description Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration (that must be going through a defiant phase: "But I want to use feet, not meters!"). Each signal seems to…
题目链接: http://poj.org/problem?id=3061 题目大意:找到最短的序列长度,使得序列元素和大于S. 解题思路: 两种思路. 一种是二分+前缀和.复杂度O(nlogn).有点慢. 二分枚举序列长度,如果可行,向左找小的,否则向右找大的. 前缀和预处理之后,可以O(1)内求和. #include "cstdio" #include "cstring" ],n,s,a,T; bool check(int x) { int l,r; ;i+x-&…
Bound Found Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 5207   Accepted: 1667   Special Judge Description Signals of most probably extra-terrestrial origin have been received and digitalized by The Aeronautic and Space Administration…
Description A sequence of N positive integers (10 < N < 100 000), each of them less than or equal 10000, and a positive integer S (S < 100 000 000) are given. Write a program to find the minimal length of the subsequence of consecutive elements o…
描述 http://poj.org/problem?id=2566 给出一个整数序列,并给出非负整数t,求数列中连续区间和的绝对值最接近k的区间左右端点以及这个区间和的绝对值. Bound Found Time Limit: 5000MS   Memory Limit: 65536K Total Submissions: 2592   Accepted: 789   Special Judge Description Signals of most probably extra-terrestr…
poj3061 Subsequence 题目链接: http://poj.org/problem?id=3061 挑战P146.题意:给定长度为n的数列整数a0,a1,...,a(n-1)以及整数S,求出总和不小于S的连续子序列的长度的最小值,如果解不存在,则输出零.$10<n<10^5,0<a_i<=10^4,S<10^8$; 思路:尺取法,设起始下标s,截止下标e,和为sum,初始时s=e=0;若sum<S,将sum增加a(e),并将e加1,若sum>=S,更…
1.POJ 3320 2.链接:http://poj.org/problem?id=3320 3.总结:尺取法,Hash,map标记 看书复习,p页书,一页有一个知识点,连续看求最少多少页看完所有知识点 必须说,STL够屌.. #include<iostream> #include<cstring> #include<cmath> #include<queue> #include<algorithm> #include<cstdio>…