http://pat.zju.edu.cn/contests/pat-practise/1032

本文深入探讨了信息技术领域的关键词提取与新标签生成技术,通过具体实例展示了如何从一篇博客中生成关键信息,包括关键词和新标签,以帮助读者更好地理解并组织相关技术知识。

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1032. Sharing (25)
时间限制
100 ms
内存限制
32000 kB
代码长度限制
16000 B
判题程序
Standard
作者
CHEN, Yue

To store English words, one method is to use linked lists and store a word letter by letter. To save some space, we may let the words share the same sublist if they share the same suffix. For example, "loading" and "being" are stored as showed in Figure 1.


Figure 1

You are supposed to find the starting position of the common suffix (e.g. the position of "i" in Figure 1).

Input Specification:

Each input file contains one test case. For each case, the first line contains two addresses of nodes and a positive N (<= 105), where the two addresses are the addresses of the first nodes of the two words, and N is the total number of nodes. The address of a node is a 5-digit positive integer, and NULL is represented by -1.

Then N lines follow, each describes a node in the format:

Address Data Next

where Address is the position of the node, Data is the letter contained by this node which is an English letter chosen from {a-z, A-Z}, and Next is the position of the next node.

Output Specification:

For each case, simply output the 5-digit starting position of the common suffix. If the two words have no common suffix, output "-1" instead.

Sample Input 1:
11111 22222 9
67890 i 00002
00010 a 12345
00003 g -1
12345 D 67890
00002 n 00003
22222 B 23456
11111 L 00001
23456 e 67890
00001 o 00010
Sample Output 1:
67890
Sample Input 2:
00001 00002 4
00001 a 10001
10001 s -1
00002 a 10002
10002 t -1
Sample Output 2:
-1
 注意前导零的输出。人家要5位的

[cpp]  view plain copy
  1. #include<iostream>  
  2. #include<cstdio>  
  3. #include<memory.h>  
  4. #include<algorithm>  
  5. #include<cstring>  
  6. #include<queue>  
  7. #include<cmath>  
  8. #include<vector>  
  9. #include<cstdlib>  
  10. #include<cmath>  
  11. #include<iomanip>  
  12. #include<string>  
  13. #include<map>  
  14.   
  15. using namespace std;  
  16.   
  17. struct Node{  
  18.     int next;  
  19.     Node():next(-1){}  
  20. };  
  21. Node nodes[1000001];  
  22. int visit[1000001];  
  23. int main(){  
  24.   
  25.     //freopen("in.txt", "r", stdin);  
  26.       
  27.     int s, t, n;  
  28.     int a, b;  
  29.     char c;  
  30.     cin>>s>>t>>n;  
  31.       
  32.     for(int i=0;i<n;++i){  
  33.         scanf("%d %c %d", &a, &c, &b);  
  34.         nodes[a].next = b;  
  35.     }  
  36.     memset(visit, 0, sizeof(visit));  
  37.     Node node;  
  38.     node.next = s;  
  39.     while(node.next!=-1){  
  40.         visit[node.next] = 1;  
  41.         node = nodes[node.next];  
  42.     }  
  43.   
  44.     node.next = t;  
  45.     while(node.next!=-1){  
  46.         if(visit[node.next]==1){  
  47.             cout<<setfill('0')<<setw(5);  
  48.             cout<<node.next<<endl;  
  49.             exit(0);  
  50.         }  
  51.         visit[node.next] = 2;  
  52.         node = nodes[node.next];  
  53.     }  
  54.     printf("-1\n");  
  55.   
  56.     //fclose(stdin);  
  57.     return 0;  
  58. }  
  59.           
──(root㉿xcs)-[/home/xcs/桌面] └─# gpg --show-keys /etc/apt/trusted.gpg.d/kali-archive-keyring.gpg gpg: 目录‘/root/.gnupg’已创建 gpg: 钥匙箱‘/root/.gnupg/pubring.kbx’已创建 pub rsa4096 2025-04-17 [SC] [有效至:2028-04-17] 827C8569F2518CC677FECA1AED65462EC8D5E4C5 uid Kali Linux Archive Automatic Signing Key (2025) <devel@kali.org> ┌──(root㉿xcs)-[/home/xcs/桌面] └─# apt update 错误:1 http://mirrors.aliyun.com/kali kali-rolling InRelease 403 Forbidden [IP: 124.225.96.42 80] 命中:2 http://http.kali.org/kali kali-rolling InRelease 获取:3 http://http.kali.org/kali kali-rolling/main i386 Packages [20.4 MB] 获取:4 http://http.kali.org/kali kali-rolling/main i386 Contents (deb) [47.7 MB] 获取:5 http://http.kali.org/kali kali-rolling/contrib i386 Packages [97.1 kB] 获取:6 http://http.kali.org/kali kali-rolling/contrib i386 Contents (deb) [183 kB] 获取:7 http://http.kali.org/kali kali-rolling/non-free i386 Packages [147 kB] 获取:8 http://mirrors.neusoft.edu.cn/kali kali-rolling/non-free i386 Contents (deb) [859 kB] 错误: 无法下载 http://mirrors.aliyun.com/kali/dists/kali-rolling/InRelease 403 Forbidden [IP: 124.225.96.42 80] 错误: 仓库 “http://mirrors.aliyun.com/kali kali-rolling InRelease” 没有数字签名。 注意: 无法安全地用该源进行更新,所以默认禁用该源。 注意: 参见 apt-secure(8) 手册以了解仓库创建和用户配置方面的细节。 ┌──(root㉿xcs)-[/home/xcs/桌面] └─#
最新发布
07-28
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