BFS篇~ 鲁迅AC比狗还狗曾经说过:这个东东好用 爱用 BECAUSE不用回溯它第一次就能搜到最优解 其实 从上面来看就可以看出BFS的一大堆优点,比如: 1 2 3 4 5 6 不用回溯 思路简单 不会TLE(butM) 最优解问题会格外简单 敲起来快 被鲁迅用过...(?) 那,这么个好东西我们该怎么整呢?学废会了又该着呢么优化呢? FIRST 基本思想(该解释参考清华大学出版社的算法竞赛) BFS的基本思想其实可以用一个简单的问题解释:老鼠走迷宫 (稍后会在DFS中也会用到该问题) BFS来解决该问题是一群老鼠走迷宫,遇见一个没走过且在迷宫内的且老鼠接下来的那一步可走到的路口就会派一只/群老鼠走这个路口,直到有老鼠走到出口。如果老鼠太多,就会MLE。(DFS会TLE是因为一只老鼠走太慢了...) 有点像多线程的处理方式,对吧?但实际上,程序还是以一条线不断画圆搜索的,只不过画的很快以至于像一个圆在变大。 这里也解释一下BFS为什么能像开了挂一样一次搜到最优解的,上面也说了,他是面积(圆or椭圆?)搜索的,本狗画了张图供大家理解和对比:(第一张BFS 第二张DFS) SECOND 具体实现和优化(优化在代码里) BFS的代码实现模版是用STL 队列来维护所搜的点 从第一个点录入队列后不断地通过方向,边界,剪枝来录入新的点,当当前点符合条件就输出并结束函数,当队列为空时代表所有可搜的点都搜完了,接下来要么输出步数,要么输出无解(有解就不会这个时候就还没输出了啊喂!)。代码如下: 没错 ...BFS的优化本狗只知道剪枝...(其实还有双源,但是框架不一样) THIRD 适用范围 一般会用在走迷宫(范围小于500*500?)还有就是已知第一个搜索数据可以推广到其他答案且不超内存和时间(可以输样例)or DFS做不出来,正常方式做不粗来又或者说题目有标签... 都看到这里了 给个赞和关注把,求求了~
复仇者_ドラゴンコア
相逢是缘,期待与你们的下次见面. 电话(15311878536)如果有事可以来找我; 有时会不接(有事时) @脸盆@八国联军开着迈巴赫@东东@.....
qing_chen
为什么第7条会有一个换行啊?官方看看吧
欢愉星神
队团加不)ด้้童帅_者仇复
建议把dp数组开到1000万
祝宸枫
苏维埃进行曲是美国人写来黑苏联的!!!不懂就不要放!!! 应该听《牢不可破的联盟》《国际歌》等 另外,把我放到苏联里去!
荔枝油饼蒸虾头ด้้้้้็้้
T1、消息堆积 T2、下雨天 T3、QQ捏捏好喝到咩噗咩噗奶茶 T4、甜筒在哪里 T5、字符变换 T6、判断子序列 T7、16进制加法 T8、X Y A B 👉 欢乐赛#26 获奖公告
AC君
995是一种子弹
Bravo-1“冥河”
我不会,但隔壁讲的比我好..... 嘻嘻,其实我会,TJ在这
ACGO欢乐赛 #26非官方PYTHON题解 > 非官方题解,本蒟蒻写着玩的 1. 消息堆积 传送门 解析: 题目很简单,如果消息数量小于99,直接输出数量,否则输出“99+”。 2. 下雨天 传送门 解析: 根据输入值判断是否为下雨天,输入值大于0输出“YES”,否则输出“NO”。 3. QQ捏捏好喝到咩噗咩噗奶茶 传送门 解析: * n: 需要多少杯奶茶 * m: 有多少钱 * k: 每k杯奶茶可以打七折 * v: 每杯奶茶的价格 如果买的杯数小于k,直接计算总价n * v;否则,计算可以打折的部分和不能打折的部分的总价。然后与m比较,判断钱是否足够,并输出相应的结果和剩余或缺少的钱。 4. 甜筒在哪里 传送门 解析: 输出小于x且为偶数的数中的最大值,如果不存在则输出-1。 5. 字符变换 传送门 解析: 比较两个字符串排序后的结果是否相等,相等输出“YES”,否则输出“NO”。 6. 判断子序列 传送门 解析: 遍历字符串t,如果t中的字符和s中的字符相等,s的指针向后移动一位。如果s的指针移动到s的末尾,输出“YES”,否则输出“NO”。 7. 16进制加法 传送门 解析: 把输入的16进制数解码成int,再相加,然后转回16进制。 8. X Y A B 传送门 解析: 计算在区间[x, y]内不能被a或b整除的数的个数。用到最大公约数(gcd)和最小公倍数(lcm)来计算同时被a和b整除的数。 总结 这次的欢乐赛题解就到这里,个人觉得这次欢乐赛难度比上次高了一些,希望这次能拿个奖品!
米哈游miHoYo
没有规则,只要不发太逆天的东西就行了
Gety盖提
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在acgo里的Minecraft
帅哥zxy
简灏俊
肘击造数据的人 测试点#1 输入:196092 输出:2045284649 AC代码: WA代码: 没错,只是因为开了long long,然后就错误了 这就说明输出爆int了 求改!!!
哈哈哈哈哈哈……*n 沈某要碎了……哈哈哈哈哈哈
悠欣忡忡
a special discuss https://www.acgo.cn/problemset/623/8831?tab=explanation
复仇者_必胜啊
#include<bits/stdc++.h> using namespace std; int main() { int a,s=0,num,sum; cin>>a; sum=a; while(a!=0) { num=a%10; s=s*10+num; a/=10; } if(s==sum)cout<<"YES"; else cout<<"NO"; return 0; }
原神牢玩家
🧠 知识点列表 * 『C++普及组X02の提高组所有知识点』 * 归并排序 * 3班MIX笔记 * 学习内容总和(补充ing) * 「提高组笔记补充」 * 史上最全X01&X02笔记 * x02广深5班 * 可行路径判断————四班专用 * 基于指针的树、二叉树以及遍历(V1.4) * 算法函数第一章——cmath函数 * 通用汇总 * 论数位DP的食用方式 * 集合与并查集 * 深度优先搜索 DFS * 图与图论入门 * 浅谈有向无环图游戏
Andy
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