题目：统计字符串中出现最多的单词和次多的单词。

测试用例："This This This a dog,not a cat!"

输出：This  3次  a  2次

思路：先把这个字符串分词，放入一个数组中。然后记录每个词出现的次数。先找出最多的那个词，然后将其次数置0，在找最多的那个词（原来次多的词）。

#include<iostream>
using namespace std;
#define MAX_COUNT_WORD 256bool isCounted[MAX_COUNT_WORD];//标记该单词已经统计过，即是否在前面出现过
int  times[MAX_COUNT_WORD];    //统计单词次数//判断是否为符合单词的字符
bool isRightChar(char data)
{return data>='a'&&data<='z'||data>='A'&&data<='Z';
}
//判断是否为相同的字符串
bool isSameStr(const char* first,const char* second)
{if(strlen(first)!=strlen(second))return false;while(*first++!=*second++)return false;return true;
}
void main()
{char* data="This This This a dog,not a cat!";int length=strlen(data);int i;//统计单词个数和最大长度int count=0;int lastindex=-1;int currentindex=-1;int maxLength=0;for(i=0;i<length;++i){currentindex=i;if(!isRightChar(data[i])){if(currentindex-lastindex>1){++count;if(currentindex-lastindex-1>maxLength)maxLength=currentindex-lastindex-1;}lastindex=currentindex;    }}//分词char** word=new char*[count];for(i=0;i<count;++i){word[i]=new char[maxLength+1];memset(word[i],0,maxLength+1);}int current_count=0;lastindex=-1;currentindex=-1;for(i=0;i<length;i++){currentindex=i;if(!isRightChar(data[i])){if(currentindex-lastindex>1){memcpy(word[current_count++],data+lastindex+1,currentindex-lastindex-1);}lastindex=currentindex;}}//比较字符串，统计次数int j;int temp_count=1;for(i=0;i<count;++i){if(isCounted[i])continue;for(j=i+1;j<count;++j){if(isSameStr(word[i],word[j])){isCounted[j]=true;temp_count++;}}times[i]=temp_count;temp_count=1;isCounted[i]=true;}//统计最多的次数 单词int max_times=0;int indexOfWord=0;for(i=0;i<count;++i){if(times[i]&×[i]>max_times){max_times=times[i];indexOfWord=i;    }}times[indexOfWord]=0;cout<<"最多的单词次数为: "<<max_times<<" 它是: "<<word[indexOfWord]<<endl;//统计次多的次数 单词max_times=0;indexOfWord=0;for(i=0;i<count;++i){if(times[i]&×[i]>max_times){max_times=times[i];indexOfWord=i; }}cout<<"次多的单词次数为: "<<max_times<<" 它是: "<<word[indexOfWord]<<endl;
}