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#pragma warning(disable : 4786)
#include <iostream>
#include <string>
#include <deque>
#define BUFFSIZE 1024
using std::cout;
using std::endl;
using std::string;
using std::deque;
typedef deque<string> strlist;
const string::size_type npos = -1;
const string ignoreChars(" \t\n\r");
inline bool IgnoreChar(char c){
return (ignoreChars.find(c) != npos);
}
/*
* 统计字符出现次数
*/
unsigned CharSummary(const string& text, unsigned usecount[], int tbllen){
unsigned count, i;
memset(usecount, 0, tbllen * sizeof(unsigned));
for(i = 0;i < text.length();usecount[unsigned(text[i++])]++);
for(count = i = 0;i < 256;i++){
if(IgnoreChar(i))continue;
if(usecount[i] > count)count = usecount[i];
}
return count;
}
/*
* 试着增长字符串
*/
char TryGrowthString(const string& text, const string& str, int maxcount, unsigned* usecount){
int count;
string::size_type pos;
char c = 0;
pos = text.find(str);
if(pos == npos)
return 0;
/* 不是出现次数最多的字符 */
c = text[pos + str.length()];
if(usecount[unsigned(c)] < maxcount)
return 0;
/* 检查文本中的出现次数 */
for(count = 0; pos + str.length() + 1 < text.length();pos += str.length()){
pos = text.find(str, pos);
if(pos == npos) break;
if(c != text[pos + str.length()]) return 0;
}
return c;
}
void PrintResult(const strlist& result){
strlist::const_iterator citer;
cout<<endl<<"The result substrings :"<<endl;
cout<<"-------------------------------------"<<endl;
for(citer = result.begin(); citer != result.end(); citer++){
cout<<'"'<<*citer<<'"'<<endl;
}
cout<<"-------------------------------------"<<endl;
cout<<"Total : "<<result.size()<<endl;
}
void main(void){
unsigned usecount[256];
char buffer[BUFFSIZE], c;
unsigned count, i;
string text;
strlist result;
/*
* 从 stdin 读入文本
*/
while(!feof(stdin)){
if(fgets(buffer,sizeof(buffer),stdin))
text += buffer;
}
/*
* 统计字符出现次数
*/
count = CharSummary(text, usecount, sizeof(usecount) / sizeof(*usecount));
cout<<"Max count :"<<count<<endl;
if(0 == count){
cout<<"There is empty string!"<<endl
<<"Bye!"<<endl;
}
/*
* 将出现次数最多的字符作为子串放入结果中
*/
for(i = 0;i < sizeof(usecount) / sizeof(*usecount);i++){
if(usecount[i] == count)
result.push_back(string(1,char(i)));
}
/*
* 查找更多的子串
*/
for(strlist::iterator iter = result.begin();iter != result.end();iter++){
c = TryGrowthString(text, *iter, count, usecount);
if(c)
result.push_back(*iter + string(1, c));
}
PrintResult(result);
cout<<"Bye!"<<endl;
}