检查随机序列重复[C++]

/*
 * File:   Main.cpp
 * Author: 88250 <DL88250@gmail.com>, http://blog.csdn.net/DL88250
 *
 * Created on May 13, 2008, 6:25 PM
 */

#include <iostream>
#include <fstream>
#include <algorithm>
#include <vector>
#include <time.h>

using namespace std;

/**
 * Check the same record in a file.
 *
 * Every record in data file is a random serial, like the followings:
 * // data file
 * 1902323484354370234844
 * 1928473090393719374
 * ....
 */

vector<string> records; // store the data records
vector<vector<string> > statistics; //statistics

/**
 * Read the records from the data file which named "data.txt" into memory,
 * using a list store them.
 */
void readRecords() {
    cout << "Get starting read records...." << endl;
    ifstream fin("data.txt");

    if (!fin) {
        cout << "Cannot open input file!" << endl;
        return;
    }

    string aLine;
    while (getline(fin, aLine)) {
        records.push_back(aLine);
    }
    fin.close();
    cout << "The amount of records: " << records.size() << endl;
}

/**
 * Display the data records in console.
 * @param amount display amount, start from {@link #records}'s beginning
 */
void displayRecords(int amount) {
    if (amount < 0 || amount > records.size()) {
        cout << "The specified amount exceeds the Data records" <<
                "size!" << endl;
    }
    cout << "Display: " << endl;
    for (int i = 0; i < amount; i++) {
        cout << records.at(i) << endl;
    }
    cout << endl;
}

/**
 * Display the statistic results in console.
 */
void displayStats() {
    cout << "Statistics: " << endl;
    cout << "A amount of the same data records: " << statistics.size() << endl;
    for (int i = 0; i < statistics.size(); i++) {
        vector<string> aEqualities = statistics.at(i);
        cout << aEqualities.at(0) << " occurs " << aEqualities.size() << endl;
    }
}
/*
bool greater(string s1, string s2){
    return s1.compare(s2);
}
 */

/**
 * Check the same data records.
 */
void checkTheSame() {

    sort(records.begin(), records.end()); // sort them

    // displayRecords(10);
    for (int i = 0; i < records.size() - 1; i++) {
        string record1 = records.at(i);
        string record2 = records.at(i + 1);
        if (record1 == record2) {
            vector<string> equalities;
            equalities.push_back(record1);
            equalities.push_back(record2);
            statistics.push_back(equalities);
        }
    }
    displayStats();
}

int main(int argc, char** argv) {
    readRecords();
  
    displayRecords(10);
    checkTheSame();
    cout << "Elapsed time: " << clock() / CLOCKS_PER_SEC << endl;
    return (EXIT_SUCCESS);
}