POJ
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Spell checker
Time Limit: 2000MS Memory Limit: 65536KTotal Submissions: 25501 Accepted: 9329
Description
You, as a member of a development team for a new spell checking program, are to write a module that will check the correctness of given words using a known dictionary of all correct words in all their forms.
If the word is absent in the dictionary then it can be replaced by correct words (from the dictionary) that can be obtained by one of the following operations:
?deleting of one letter from the word;
?replacing of one letter in the word with an arbitrary letter;
?inserting of one arbitrary letter into the word.
Your task is to write the program that will find all possible replacements from the dictionary for every given word.
If the word is absent in the dictionary then it can be replaced by correct words (from the dictionary) that can be obtained by one of the following operations:
?deleting of one letter from the word;
?replacing of one letter in the word with an arbitrary letter;
?inserting of one arbitrary letter into the word.
Your task is to write the program that will find all possible replacements from the dictionary for every given word.
Input
The first part of the input file contains all words from the dictionary. Each word occupies its own line. This part is finished by the single character '#' on a separate line. All words are different. There will be at most 10000 words in the dictionary.
The next part of the file contains all words that are to be checked. Each word occupies its own line. This part is also finished by the single character '#' on a separate line. There will be at most 50 words that are to be checked.
All words in the input file (words from the dictionary and words to be checked) consist only of small alphabetic characters and each one contains 15 characters at most.
The next part of the file contains all words that are to be checked. Each word occupies its own line. This part is also finished by the single character '#' on a separate line. There will be at most 50 words that are to be checked.
All words in the input file (words from the dictionary and words to be checked) consist only of small alphabetic characters and each one contains 15 characters at most.
Output
Write to the output file exactly one line for every checked word in the order of their appearance in the second part of the input file. If the word is correct (i.e. it exists in the dictionary) write the message: " is correct". If the word is not correct then write this word first, then write the character ':' (colon), and after a single space write all its possible replacements, separated by spaces. The replacements should be written in the order of their appearance in the dictionary (in the first part of the input file). If there are no replacements for this word then the line feed should immediately follow the colon.
Sample Input
iishashavebemymorecontestmetooifaward#meawaremcontesthavooorifimre#
Sample Output
me is correctaware: awardm: i my mecontest is correcthav: has haveoo: tooor:i is correctfi: imre: more me
Source
Northeastern Europe 1998
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题目大意:首先给你多个字典中的字符串,然后给你需要判断的字符串,判断字典中是否有该字符串,如果没有,判断是否可以通过字符串的增删一个字符或改变一个字符得到目标字符串。
字符串比较的水题。写两个比较函数分别比较字符串长度相等的情况和长度差1的情况即可。
附上AC代码:
#include<iostream>#include<string>using namespace std;const int maxn=10000+5;string s[maxn];string st;int cmp(string &a,string &b){ int sum=0; for(int i=0;i<int(a.length());i++) { if(a[i]!=b[i])sum++; if(sum>1)return 0; } return 1;}int cmp1(string &a,string &b){ int sum=0; for(int i=0,j=0;i<int(a.length());) { if(a[i]!=b[j]) { sum++; i++; } else if(a[i]==b[j]){i++;j++;} if(sum>1)return 0; } return 1;}int main(){ ios::sync_with_stdio(false);// freopen("in.txt","r",stdin); int cnt=0; while(cin>>st&&st[0]!='#') { s[cnt++]=st;// sort(s,s+cnt); } while(cin>>st&&st[0]!='#') { int flag=0; for(int i=0;i<cnt;i++) { if(s[i]==st) { flag=2;break; } else if(st.length()==s[i].length()) { if(cmp(st,s[i])) flag=1; } else if(st.length()>s[i].length()) { if(cmp1(st,s[i])) flag=1; } else if(st.length()<s[i].length()) { if(cmp1(s[i],st)) flag=1; } } if(flag==2)cout<<st<<" is "<<"correct"<<endl; else if(flag==0)cout<<st<<":"<<endl; else { cout<<st<<":"; for(int i=0;i<cnt;i++) { if(st.length()>s[i].length()) { if(cmp1(st,s[i])) cout<<" "<<s[i]; } else if(st.length()<s[i].length()) { if(cmp1(s[i],st)) cout<<" "<<s[i]; } else if(st.length()==s[i].length()) { if(cmp(s[i],st)) cout<<" "<<s[i]; } } cout<<endl; } } return 0;}
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