C++Primer習題6.12

題目：編寫一個小程序，從標準輸入讀入一系列 string 對象，尋找連續重複出現的單詞。程序應該找出滿足以下條件的單詞的輸入位置：該單詞的後面緊跟着再次出現自己本身。跟蹤重複次數最多的單詞及其重複次數。輸出重複次數的最大值，若沒有單詞重複則輸出說明信息。例如，如果輸入是：

     how, now now now brown cow cow

My code：

#include<iostream>
#include<string>
using namespace std;

int main()
{
    //vector<string> svec;
    string preWord = "", word, maxWord;
    int occurs = 0, maxOccurs = 0;     //若有重複，記錄次數
    while(cin >> word)
    {
        //第一次輸入，更新preWrod
        if(preWord == "")
        {
            preWord = word;
            occurs = 1;
            continue;
        }//如果出現重複單詞，記錄加1
        if(preWord == word)
        {
            ++occurs;
        }//否則如果出現不同單詞則判斷，如果重複次數大於已記錄的最大值，則更新最大值
        else
        {
            if(maxOccurs < occurs)
            {
                maxWord = preWord;
                maxOccurs = occurs;
            }
            //更新preword，並從頭開始計數
            preWord = word;
            occurs = 1;
        }
    }
    if(maxOccurs < occurs)			//注意最後一次循環容易忽略
    {
        maxWord = word;
        maxOccurs = occurs;
    }
    if(maxOccurs != 1 )
        cout << maxWord << ": " << maxOccurs << endl;
    else
        cout << "There is no repetition!" << endl;
    return 0;
}

reference answer；

#include<iostream>
#include<string>
using namespace std;

int main()
{
    string preWord, currWord;       //當前輸入的單詞及前一次單詞
    string repWord;                 //重複次數最多的單詞
    //當前單詞的重複次數及單詞重複的次數最大值
    int currCnt = 0, maxCnt = 1;
    cout << "Enter some words(Ctr+Z to end): "<< endl;
    while(cin >> currWord)
    {
        if(currWord == preWord)     //當前單詞重複出現
            ++currCnt;
        else //出現新單詞
        {
            if(currCnt > maxCnt)//出現了重複次數更多的單詞，更新4
            {
                maxCnt = currCnt;
                repWord = preWord;
            }
            currCnt = 1;
        }
        preWord = currWord;
    }
    if(currCnt > maxCnt)
    {
        maxCnt = currCnt;
        repWord = preWord;
    }
    if(maxCnt != 1)
        cout << '"' << repWord << '"' << " repeated for " << maxCnt << " times!" << endl;
    else
        cout << "There is no repeated word." << endl;
    return 0;
}