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嘟嘟嘟 刚开始我以为如果这头牛撞开一个干草堆的话,获得的冲刺距离只有新增的部分,但实际上是加上原来的部分的. 暴力很好写,区间排完序后一次判断每一个区间是否能逃脱,复杂度O(n2). 优化想起来也不难:如果一个区间 i 能逃脱,区间 j 能到达 i,则 j 也能逃脱.所以对于每个区间开一个标记数组,记录能否逃脱.然后枚举区间的时候向两边扩,如果到达了一个能逃脱的区间就返回,并标记.复杂度虽然不能准确算出来,但能A这道题. #include<cstdio> #include<iostrea…
Counting Haybales 题目描述 Farmer John is trying to hire contractors to help rearrange his farm, but so far all of them have quit when they saw the complicated sequence of instructions FJ wanted them to follow. Left to complete the project by himself, he…
P3130 [USACO15DEC]计数haybalesCounting Haybales 1)给定一段连续的田地,给每一个田地都增加一些新的草包. 2)给定一段连续的田地,找出草包最少的田地有多少草包. 3)给定一段连续的田地,统计一共有多少草包. 错误日志: \(pushdown\) 时记录懒标记用了 \(int\) , 下次(在没有把握的情况下)应全部替换 Solution 线段树, 懒标记, 靠前练手 Code #include<iostream> #include<cstdio…
[BZOJ4101][Usaco2015 Open]Trapped in the Haybales (Silver) Description Farmer John has received a shipment of N large hay bales (1≤N≤100,000), and placed them at various locations along the road connecting the barn with his house. Each bale j has a s…
[BZOJ4099]Trapped in the Haybales Gold Description Farmer John has received a shipment of N large hay bales (1≤N≤100,000), and placed them at various locations along the road leading to his barn. Unfortunately, he completely forgets that Bessie the c…
Counting Haybales 时间限制: 50 Sec  内存限制: 256 MB提交: 52  解决: 18[提交][状态][讨论版] 题目描述 Farmer John is trying to hire contractors to help rearrange his farm, but so far all of them have quit when they saw the complicated sequence of instructions FJ wanted them…
[USACO15OPEN]回文的路径Palindromic Paths 题目描述 Farmer John's farm is in the shape of an N \times NN×N grid of fields (1 \le N \le 5001≤N≤500), each labeled with a letter in the alphabet. For example: ABCD BXZX CDXB WCBA Each day, Bessie the cow walks from…
P3184 [USACO16DEC]Counting Haybales数草垛 题目描述 Farmer John has just arranged his NN haybales (1 \leq N \leq 100,0001≤N≤100,000 ) at various points along the one-dimensional road running across his farm. To make sure they are spaced out appropriately, pl…
P3130 [USACO15DEC]计数haybalesCounting Haybales 题目描述 Farmer John is trying to hire contractors to help rearrange his farm, but so far all of them have quit when they saw the complicated sequence of instructions FJ wanted them to follow. Left to complet…
P3126 [USACO15OPEN]回文的路径Palindromic Paths 看到这题题解不多,蒟蒻便想更加通俗易懂地分享一点自己的心得,欢迎大佬批评指正^_^ 像这种棋盘形的两边同时做的dp还有 P1006 传纸条, P1004 方格取数, T35377 大教室中传纸条 一.思路改进 对于这种题目最暴力的方法无非是分别枚举左上角和右下角两点坐标 (f[ i ][ j ][ k ][ l ] = f[ i-1 ][ j ][ k+1 ][ l ] + f[ i-1 ][ j ][ k ][…