题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

P1339 [USACO09OCT]热浪Heat Wave 题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to delive…

题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

题目链接:https://www.luogu.org/problemnew/show/P1339 解题思路: 一道简单的最短路水题,dijkstra解法模板思路:https://www.cnblogs.com/lipeiyi520/p/10340361.html AC代码: #include<bits/stdc++.h> using namespace std; const int ff=0x3f3f3f; ][],a,b,c; ]; ]; void dij(int s){ memset(vi…

题目链接 https://www.luogu.org/problemnew/show/P1339 最短路 解题思路 dijkstra直接过 注意: 双向边 memset ma数组要在读入之前 AC代码 #include<iostream> #include<cstring> using namespace std; int n,m,ts,te; ]; ]; ][]; int main(){ cin>>n>>m>>ts>>te; mem…

嗯... 题目链接:https://www.luogu.org/problem/P1339 这道题是水的不能在水的裸最短路问题...这里用的dijkstra 但是自己进了一个坑—— 因为有些城市之间可能还没有道路,自己只是将其初始化为0,而应该初始化为0x3f3f,从而表示两个城市之间没有道路... AC代码: #include<cstdio> #include<iostream> #include<algorithm> #include<cstring>…

题目传送门 这道题实际非常简单好奇是怎么变黄的... 其实也就是一个SPFA,本人非常懒,不想打邻接表,直接用矩阵就好啦... #include<bits/stdc++.h> using namespace std; ][],m,fr,to; void add(int x,int y,int z){a[x][y]=z;} ]; ]; queue<int> q; void SPFA(int from){ vis[; q.push(; while(!q.empty()){ ; q.po…

思路:裸SPFA过一遍(建议使用邻接链表存储),无向图,无向图,无向图,重要的事情要说三遍!!!蜜汁RE是什么鬼????第九个点数组开到20K,第十个点数组开到30K才AC.或许我代码写的有bug?(逃 CODE: #include<iostream> #include<queue> using namespace std; queue<int>q; struct Edge{ int pre,to,w; }edge[]; ]; ]; ]; int T, C, Ts, T…

[题解] 最短路.那么直接写dijkstra就好了. #include<cstdio> #include<algorithm> #include<cstring> #define LL long long #define rg register #define N 200010 using namespace std; int n,m,s,t,tot,last[N],dis[N],pos[N]; struct edge{ int to,pre,dis; }e[N<…

题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

我太lj了,所以趁着夜色刷了道最短路的水题....然后,,我炸了. 题目描述: The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to d…

题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

-------------------------------------- 农夫约翰再显神威,双向热浪,双倍数组 (双倍大小,否则RE) ---------------------------------- 题目链接:MIKU ----------------------------------- 怎么说呢,裸的最短路,但是好像floyd不优化不行 SPFA好写是好写,但是容易被卡 有空还是学Dijkstra比较好 ----------------------------------- SPF…

题目链接 这道题纯属是一个裸的SPFA: 建议先把模板AC之后再做. 只需要做一些手脚,就是在加边的时候加一个双向边就好. 然后再第一次加点的时候 看不懂模板的出门左转度娘. 推荐下面一片讲解: 友链 所以说,直接上代码. #include<iostream> #include<algorithm> #include<cstdio> #include<cstdlib> #include<queue> using namespace std; st…

未经同意,不得转载. The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nut…

题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

Luogu P1339 热浪Heat Wave 裸·单源最短路. 但是! 有以下坑点: 算过复杂度发现Floyd跑不过去就不要用了. 如果建边是双向边,边的数组大小要开两倍! 考场上如果再把初始化的$dis[i]=INF$写成$dis[n]=INF$,或者忘记$dis[s]=0$之类的话,就直接火葬场了-- #include<bits/stdc++.h> #define N 2510 #define M 6210 #define INF 0x3f3f3f3f using namespace s…

洛谷:传送门 bzoj:传送门 参考资料: [1]:https://xht37.blog.luogu.org/p5304-gxoigzoi2019-lv-xing-zhe [2]:http://www.cnblogs.com/cjyyb/p/10736124.html 题意: 一个图 n 个点 m 条边,里面有 k 个特殊点,问这 k 个点之间两两最短路的最小值是多少? 之所以做这道题,是因为早晨的时候,做CF的这道题(戳这里),题意都木有读懂(…

2763: [JLOI2011]飞行路线 Time Limit: 10 Sec  Memory Limit: 128 MBSubmit: 4630  Solved: 1797[Submit][Status][Discuss] Description Alice和Bob现在要乘飞机旅行,他们选择了一家相对便宜的航空公司.该航空公司一共在n个城市设有业务,设这些城市分别标记为0到n-1,一共有m种航线,每种航线连接两个城市,并且航线有一定的价格.Alice和Bob现在要从一个城市沿着航线到达另一个城…

洛谷P1462-通往奥格瑞玛的道路 题目描述 在艾泽拉斯,有\(n\)个城市.编号为\(1,2,3,...,n\). 城市之间有\(m\)条双向的公路,连接着两个城市,从某个城市到另一个城市,会遭到联盟的攻击,进而损失一定的血量. 每次经过一个城市,都会被收取一定的过路费(包括起点和终点).路上并没有收费站. 假设\(1\)为暴风城,\(n\)为奥格瑞玛,而他的血量最多为\(b\),出发时他的血量是满的. 歪嘴哦不希望花很多钱,他想知道,在可以到达奥格瑞玛的情况下,他所经过的所有城市中最多的一次…

https://www.luogu.org/problem/show?pid=1339 题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the ch…

AC代码 #include<bits/stdc++.h> using namespace std; const int MAXN=62000+10,INF=999999; struct Edge{ int u,v,w,next; }edge[MAXN]; int head[MAXN],n,m,s,t,dist[MAXN],cnt; bool vis[MAXN]; void addedge(int x,int y,int z){ edge[cnt].u=x; edge[cnt].v=y; edg…

题目描述 The good folks in Texas are having a heatwave this summer. Their Texas Longhorn cows make for good eating but are not so adept at creating creamy delicious dairy products. Farmer John is leading the charge to deliver plenty of ice cold nutritiou…

P1339 热浪 529通过 1.3K提交 题目提供者yeszy 标签图论福建省历届夏令营 难度普及+/提高 提交该题 讨论 题解 记录 最新讨论 求助...为什么是未知错误… 求修正,貌似死循环 第六个点和第九个点怎么了 细微之处 最短路 题目描述 德克萨斯纯朴的民眾们这个夏天正在遭受巨大的热浪!!!他们的德克萨斯长角牛吃起来不错,可是他们并不是很擅长生產富含奶油的乳製品.Farmer John此时以先天下之忧而忧,后天下之乐而乐的精神,身先士卒地承担起向德克萨斯运送大量的营养冰凉的牛奶的重任…

题目:https://www.luogu.org/problemnew/show/P1339 题意:给定一张图,问起点到终点的最短路. 思路:dijkstra板子题. 很久没有写最短路了.总结一下dijkstra的步骤吧. d数组用于表示当前最短路径,vis数组用于标记当前点是否已经在最短路集合中了. 每次找到一个d最小的节点,表示他已经无法更短了,把他加入集合,用他去更新其他的节点.一共做n-1次. #include<cstdio> #include<cstdlib> #incl…

P2376 [USACO09OCT]津贴Allowance 题目描述 作为创造产奶纪录的回报,\(Farmer\) \(John\)决定开始每个星期给\(Bessie\)一点零花钱. \(FJ\)有一些硬币,一共有\(N(1<=N<=20)\)种不同的面额.每一个面额都能整除所有比它大的面额. 他想用给定的硬币的集合,每个星期至少给\(Bessie\)某个零花钱的数目\(C(1<=C<=100000000)\).请帮他计算他最多能支付多少个星期的零花钱. 输入输出格式 输入格式:…

P2958 [USACO09OCT]木瓜的丛林Papaya Jungle 题目描述 Bessie has wandered off the farm into the adjoining farmer's land. He raises delicious papaya fruit, which is a delicacy for cows. The papaya jungle is partitioned into a grid of squares with R rows and C col…

P2959 [USACO09OCT]悠闲漫步The Leisurely Stroll 题目描述 Bessie looks out the barn door at the beautiful spring day and thinks to herself, 'I'd really like to enjoy my walk out to the pastures for the tender spring grass.' She knows that once she leaves the b…

P2960 [USACO09OCT]Milkweed的入侵Invasion of the Milkweed 题目描述 Farmer John has always done his best to keep the pastures full of luscious, delicious healthy grass for the cows. He has lost the battle, though, as the evil milkweed has attained a foothold…

P2958 [USACO09OCT]木瓜的丛林Papaya Jungle 题目描述 Bessie has wandered off the farm into the adjoining farmer's land. He raises delicious papaya fruit, which is a delicacy for cows. The papaya jungle is partitioned into a grid of squares with R rows and C col…