題目連結

Andy, 8, has a dream - he wants to produce his
very own dictionary. This is not an easy task for
him, as the number of words that he knows is,
well, not quite enough. Instead of thinking up all
the words himself, he has a briliant idea. From
his bookshelf he would pick one of his favourite
story books, from which he would copy out all
the distinct words. By arranging the words in
alphabetical order, he is done! Of course, it is
a really time-consuming job, and this is where a
computer program is helpful.
You are asked to write a program that lists
all the different words in the input text. In this
problem, a word is defined as a consecutive sequence
of alphabets, in upper and/or lower case.
Words with only one letter are also to be considered. Furthermore, your program must be CaSe InSeNsItIvE.
For example, words like “Apple”, “apple” or “APPLE” must be considered the same.
Input
The input file is a text with no more than 5000 lines. An input line has at most 200 characters. Input
is terminated by EOF.
Output
Your output should give a list of different words that appears in the input text, one in a line. The
words should all be in lower case, sorted in alphabetical order. You can be sure that he number of
distinct words in the text does not exceed 5000.
Sample Input
Adventures in Disneyland
Two blondes were going to Disneyland when they came to a fork in the
road. The sign read: “Disneyland Left.”
So they went home.
Sample Output
a
adventures
blondes
came
disneyland
fork
going
home
in
left
read
road
sign
so
the
they
to
two
went
were
when
題意：
輸入一段英語文章，把單詞提取出來並按照字典序排序，排序後的字母不能重複；
思路：
先輸入，分成單個字元，處理後的單個單詞處理並存儲到二維數組裡，用STL排序（好好看看），最後判斷相鄰是否相等，就可以去重了，注意陣列開的大小；

#include<cstdio>
#include<algorithm>
#include<iostream>
#include<cstring>
#include<cmath>
#include<map>
#include<string>
#include<vector>
#define max_n 5010
using namespace std;
char str[max_n*1000],ch[max_n*1000],a[max_n*10][110];

vector<string> words;

int
 
 main()
{
    int j=0;
    while(gets(str))
    {
        int p=0;
        int len=strlen(str);
        if(len==0) continue;
        str[len]=' ';
        for(int i=0;i<=len;i++) //處理字串 
        {
            if(str[i]>='A' && str[i]<='Z')//有大小寫
                ch[p++]=str[i]-'A'+'a';
            else
 
 if(str[i]>='a' && str[i]<='z')
                ch[p++]=str[i];
            else
            {
                ch[p]='\0';
                if(p!=0)
                    strcpy(a[j++],ch);
                p=0;
            }
        }
    }
    for(int i=0;i<j;i++)
        words.push_back(a[i]);
    sort(words.begin(),words.end()); //排序 
    cout<<words[0]<<"\n";
    for(int i=1;i<words.size();i++)
    {
        if(words[i]!=words[i-1]) //去重 
                cout<<words[i]<<"\n";
    }
    return 0;
}