2016ACM-ICPC网络赛北京赛区 1001 （trie树牌大模拟）

【题目传送门】

1383 : The Book List

时间限制:1000ms

单点时限:1000ms

内存限制:256MB

描述

The history of Peking University Library is as long as the history of Peking University. It was build in 1898. At the end of year 2015, it had about 11,000 thousand volumes of books, among which 8,000 thousand volumes were paper books and the others were digital ones. Chairman Mao Zedong worked in Peking University Library for a few months as an assistant during 1918 to 1919. He earned 8 Dayang per month there, while the salary of top professors in Peking University is about 280 Dayang per month.

Now Han Meimei just takes the position which Chairman Mao used to be in Peking University Library. Her first job is to rearrange a list of books. Every entry in the list is in the format shown below:

CATEGORY 1/CATEGORY 2/..../CATEGORY n/BOOKNAME

It means that the book BOOKNAME belongs to CATEGORY n, and CATEGORY n belongs to CATEGORY n-1, and CATEGORY n-1 belongs to CATEGORY n-2...... Each book belongs to some categories. Let's call CATEGORY1  "first class category", and CATEGORY 2 "second class category", ...ect. This is an example:

MATH/GRAPH THEORY
ART/HISTORY/JAPANESE HISTORY/JAPANESE ACIENT HISTORY
ART/HISTORY/CHINESE HISTORY/THREE KINDOM/RESEARCHES ON LIUBEI
ART/HISTORY/CHINESE HISTORY/CHINESE MORDEN HISTORY
ART/HISTORY/CHINESE HISTORY/THREE KINDOM/RESEARCHES ON CAOCAO

Han Meimei needs to make a new list on which the relationship between books and the categories is shown by indents. The rules are:

1) The n-th class category has an indent of  4×(n-1) spaces before it.
2) The book directly belongs to the n-th class category has an indent of  4×n spaces before it.
3) The categories and books which directly belong to a category X should be list below X in dictionary order. But all categories go before all books. 
4) All first class categories are also list by dictionary order.

For example, the book list above should be changed into the new list shown below:

ART
    HISTORY
        CHINESE HISTORY
            THREE KINDOM
                RESEARCHES ON CAOCAO
                RESEARCHES ON LIUBEI
            CHINESE MORDEN HISTORY
        JAPANESE HISTORY
            JAPANESE ACIENT HISTORY
MATH
    GRAPH THEORY

Please help Han Meimei to write a program to deal with her job.

输入

There are no more than 10 test cases.
Each case is a list of no more than 30 books, ending by a line of "0". 
The description of a book contains only uppercase letters, digits, '/' and spaces, and it's no more than 100 characters.
Please note that, a same book may be listed more than once in the original list, but in the new list, each book only can be listed once. If two books have the same name but belong to different categories, they are different books.

输出

For each test case, print "Case n:" first(n starts from 1), then print the new list as required.

样例输入

B/A
B/A
B/B
0
A1/B1/B32/B7
A1/B/B2/B4/C5
A1/B1/B2/B6/C5
A1/B1/B2/B5
A1/B1/B2/B1
A1/B3/B2
A3/B1
A0/A1
0

样例输出

Case 1:
B
    A
    B
Case 2:
A0
    A1
A1
    B
        B2
            B4
                C5
    B1
        B2
            B6
                C5
            B1
            B5
        B32
            B7
    B3
        B2
A3
    B1

---

字典树大模拟。因为输出要按字典序输出，所以输入的时候需要给字符串排个序。而且输出的时候在相同层有后继的优先输出（题目没说清QAQ），所以在输出上要一点小处理。

 #include<cstdio>
 #include<iostream>
 #include<cstring>
 #include<algorithm>
 #define clr(x) memset(x,0,sizeof(x))
 #define maxnode 3010
 using namespace std;
 struct node
 {
     int lt,rt;
     char *str;
     int val;
 };
 struct trie
 {
     node poi[maxnode];
     int nodelen;
     int head;
     trie() {nodelen=; head=; clr(poi);}
     void clear() {nodelen=;head=; clr(poi);}
     void insert(int fa,int now,char *stri)
     {
 //       printf("fat:%d p:%d nodelen:%d head:%d char:%s\n",fa,now,nodelen,head,stri);
         int end=false,i=;
         while(stri[i] && stri[i]!='/')
             i++;
         if(stri[i]==)
             end=true;
         stri[i]=;
         if(!now)
         {
             now=newnode(stri);
             poi[fa].lt=now;
             if(!end)
                 insert(now,,stri+i+);
             else
                 poi[now].val++;
             return ;
         }
         int q;
         while(now && strcmp(poi[now].str,stri)!=)
         {
             q=now;
             now=poi[now].rt;
         }
         if(!now)
         {
            now=newnode(stri);
            poi[q].rt=now;
         }
         if(!end)
         {
             insert(now,poi[now].lt,stri+i+);
         }
         else
         {
             poi[now].val++;
         }
         return ;
     }
     int newnode(char *stri)
     {
         if(!head)
         {
             head=nodelen;
         }
         poi[nodelen].str=stri;
         return nodelen++;
     }
     void output(int node,int dep)
     {
         if(node==)
         {
             return ;
         }
         int q=node;
         while(q)
         {
             if(poi[q].lt!=)
             {
                 for(int i=;i<dep;i++)
                     printf("    ");
                 printf("%s",poi[q].str);
                 printf("\n");
                 output(poi[q].lt,dep+);
             }
             q=poi[q].rt;
         }
         q=node;
         while(q)
         {
             if(poi[q].val)
             {
                 for(int i=;i<dep;i++)
                     printf("    ");
                 printf("%s",poi[q].str);
                 printf("\n");
             }
             q=poi[q].rt;
         }
      return ;
     }

 }tried;
 bool cmp(char *a,char *b)
 {
     return strcmp(a,b)<;
 }
 char s[],deal[maxnode][];
 char *dir[maxnode];
 int main()
 {
     int n,kase=;
     while(fgets(s,,stdin)!=NULL)
     {
         clr(deal);
         n=;
         s[strlen(s)-]='\0';
         tried.clear();
         strcpy(deal[n++],s);
         dir[]=deal[];
         while(fgets(s,,stdin)!=NULL && strcmp(s,"0\n")!=)
         {
             s[strlen(s)-]='\0';
             strcpy(deal[n],s);
             dir[n]=deal[n];
             n++;
         }
         sort(dir+,dir+n,cmp);
         for(int i=;i<n;i++)
         {
             tried.insert(,tried.head,dir[i]);
         }
         printf("Case %d:\n",++kase);
         tried.output(tried.head,);
     }
     return ;
 }