UVA 10115 - Automatic Editing（字符串）-优快云博客

Automatic Editing

Source file:	`autoedit.`{`c`, `cpp`, `java`, `pas`}
Input file:	`autoedit.in`
Output file:	`autoedit.out`

Text-processing tools like awk and sed allow you to automatically perform a sequence of editing operations based on a ｓcript. For this problem we consider the specific case in which we want to perform a series of string replacements, within a single line of text, based on a fixed set of rules. Each rule specifies the string to find, and the string to replace it with, as shown below.

Rule Find Replace-by
1. ban bab
2. baba be
3. ana any
4. ba b hind the g

To perform the edits for a given line of text, start with the first rule. Replace the first occurrence of the find string within the text by thereplace-by string, then try to perform the same replacement again on the new text. Continue until the find string no longer occurs within the text, and then move on to the next rule. Continue until all the rules have been considered. Note that (1) when searching for a findstring, you always start searching at the beginning of the text, (2) once you have finished using a rule (because the find string no longer occurs) you never use that rule again, and (3) case is significant.

For example, suppose we start with the line

banana boat

and apply these rules. The sequence of transformations is shown below, where occurrences of a find string are underlined and replacements are boldfaced. Note that rule 1 was used twice, then rule 2 was used once, then rule 3 was used zero times, and then rule 4 was used once.

Before After
banana boat babana boat
babana boat bababa boat
bababa boat beba boat
beba boat behind the goat

The input contains one or more test cases, followed by a line containing only 0 (zero) that signals the end of the file. Each test case begins with a line containing the number of rules, which will be between 1 and 10. Each rule is specified by a pair of lines, where the first line is the find string and the second line is the replace-by string. Following all the rules is a line containing the text to edit. For each test case, output a line containing the final edited text.

Both find and replace-by strings will be at most 80 characters long. Find strings will contain at least one character, but replace-bystrings may be empty (indicated in the input file by an empty line). During the edit process the text may grow as large as 255 characters, but the final output text will be less than 80 characters long.

The first test case in the sample input below corresponds to the example shown above.

Example input:

4
ban
bab
baba
be
ana
any
ba b
hind the g
banana boat
1
t
sh
toe or top
0

Example output:

behind the goat
shoe or shop

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按题目描述的替换即可，先把前一个规则所有的都替换掉再执行下一个规则

第一次用strstr还不是很熟练……

strstr(str,s)可以找到str中s的首地址（可以得到从s开始后面的所有字符），找不到返回空（NULL）

将str分成三段，strstr得到第二段（要替换的内容）的首地址，把第三段保存起来，然后把第二段替换掉再连上第三段即可

#include <iostream>
#include <cstdio>
#include <cstring>

using namespace std;

char str[333],s1[22][333],s2[22][333];

int main()
{
    int n;
    char *p,temp[333];
    while(~scanf("%d",&n))
    {
        if(n==0) break;
        getchar();
        for(int i=0; i<n; i++)
        {
            gets(s1[i]);
            gets(s2[i]);
        }
        gets(str);
        for(int i=0; i<n; i++)
        {
            p=strstr(str,s1[i]);
            if(p!=NULL)
            {
                strcpy(temp,p+strlen(s1[i]));//保存第三段
                strcpy(p,s2[i]);//替换第二段
                strcpy(p+strlen(s2[i]),temp);//连接第三段
                i--;//继续按这个规则查找
            }
        }
        puts(str);
    }
    return 0;
}