用二元组$(city,fuel)$即可记录所有状态,以当前花费为关键字优先队列,开数组记录直接做即可 有一个点在于每次不用枚举所有的加油数量,只需要加一即可,因为如果在加一升更优的话又会扩展出加更多油的状态,不必枚举过多 #include<iostream> #include<cstdio> #include<queue> #include<cstring> using namespace std; ; ; int n,m,a[maxn],c; struct…

题目链接:http://poj.org/problem?id=3635 题意题解等均参考:POJ 3635 - Full Tank? - [最短路变形][优先队列优化Dijkstra]. 一些口胡: 说实话,上次写类似的二维状态最短路Gym 101873C - Joyride - [最短路变形][优先队列优化Dijkstra],我没能把手写二叉堆优化Dijkstra的给写出来. 这次费了点功夫,也算是给写出来了,需要注意的点还是有点多的.而且我终于深刻理解为啥不推荐手写二叉堆了,主要是代码量相比…

题目链接:http://poj.org/problem?id=3635 Description After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you visited. Maybe you could have saved some money if you were…

刷题备忘录,for bug-free 招行面试题--求无序数组最长连续序列的长度,这里连续指的是值连续--间隔为1,并不是数值的位置连续 问题: 给出一个未排序的整数数组,找出最长的连续元素序列的长度. 如: 给出[100, 4, 200, 1, 3, 2], 最长的连续元素序列是[1, 2, 3, 4].返回它的长度:4. 你的算法必须有O(n)的时间复杂度 . 解法: 初始思路 要找连续的元素,第一反应一般是先把数组排序.但悲剧的是题目中明确要求了O(n)的时间复杂度,要做一次排序,是不能达…

Crazy TankTime Limit: 2000/1000 MS (Java/Others)    Memory Limit: 32768/32768 K (Java/Others)Total Submission(s): 5033    Accepted Submission(s): 1017 Problem DescriptionCrazy Tank was a famous game about ten years ago. Every child liked it. Time fli…

前言   [LeetCode 题解]系列传送门:  http://www.cnblogs.com/double-win/category/573499.html   1.题目描述 There are N gas stations along a circular route, where the amount of gas at station i is gas[i]. You have a car with an unlimited gas tank and it costs cost[i]…

其实这题前前后后的思考时间加起来应该有两天之久了,dp状态,转移方式等等都还是比较好想,然而左看右看觉得spfa复杂度未免太爆炸……然后选择看了一篇题解,发现在多重优化之下,其实是可以过的…… 首先建立状态,这个应该比较明显:\(f[l][r][x][y]\) 代表合并完区间 \(l\) ~\(r\) 之后,机器人停在 \(x,y\) 处所需要的最少移动次数.转移状态即为: \(f[l][r][x][y] = f[l][k][x][y] + f[k + 1][r][x][y] \left ( l…

题目 After going through the receipts from your car trip through Europe this summer, you realised that the gas prices varied between the cities you visited. Maybe you could have saved some money if you were a bit more clever about where you filled your…

A. Fair Game time limit per test 1 second memory limit per test 256 megabytes input standard input output standard output Petya and Vasya decided to play a game. They have n cards (n is an even number). A single integer is written on each card. Befor…

我要举报本次校赛出题人的消极出题!!! 官方题解请戳:http://3.scnuacm2015.sinaapp.com/?p=89(其实就是一堆代码没有题解) A. 树链剖分数据结构板题 题目大意:我没看,看不懂. 基本思路:我不会. 参考代码:找Oyk老师和Czj老师去. B. The background of water problem 题目大意(大写加粗的水题):给定$N$个学生和他们$K$个科目的成绩$S_i$,再给出各科目$K_i$的权重顺序$Q_i$,求排名之后,拥有id为$X$的…