C++, assignment must print out \"Assignment Complete.\" Thanks! Topics are sorti

ID: 3747853 • Letter: C

Question

C++, assignment must print out "Assignment Complete." Thanks! Topics are sorting. To make the functions declared on the trendtracker.h file the desired time complexcity asked on the comments only changes on trendtracker.cpp. Recommended to use the second vector in the header file.

/****************************** main.cpp *******************************/

#include <cassert>

#include <fstream>

#include <iostream>

#include <cstdlib>

#include <string>

#include "trendtracker.h"

using namespace std;

inline void _test(const char* expression, const char* file, int line)

{

cerr << "test(" << expression << ") failed in file " << file;

cerr << ", line " << line << "." << endl;

abort();

}

#define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__))

int main()

{

// Setup

vector<string> R;

string s, line;

// Test constructor, size(), popularity(), tweeted()

Trendtracker T1("small.txt");

test(T1.size() == 4);

test(T1.popularity("#algorithms") == 0);

test(T1.popularity("#cs4all") == 0);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 0);

test(T1.popularity("#C++") == 0);

T1.tweeted("#programming");

test(T1.popularity("#algorithms") == 0);

test(T1.popularity("#cs4all") == 0);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 1);

test(T1.popularity("#C++") == 0);

T1.tweeted("#programming");

test(T1.popularity("#algorithms") == 0);

test(T1.popularity("#cs4all") == 0);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 2);

test(T1.popularity("#C++") == 0);

T1.tweeted("#programming");

test(T1.popularity("#algorithms") == 0);

test(T1.popularity("#cs4all") == 0);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

T1.tweeted("#cs4all");

test(T1.popularity("#algorithms") == 0);

test(T1.popularity("#cs4all") == 1);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

T1.tweeted("#algorithms");

test(T1.popularity("#algorithms") == 1);

test(T1.popularity("#cs4all") == 1);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

T1.tweeted("#cs4all");

test(T1.popularity("#algorithms") == 1);

test(T1.popularity("#cs4all") == 2);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

T1.tweeted("#datastructures");

test(T1.popularity("#algorithms") == 1);

test(T1.popularity("#cs4all") == 2);

test(T1.popularity("#datastructures") == -1);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

Trendtracker T2("small.txt");

T2.tweeted("#programming");

T2.tweeted("#C++");

T2.tweeted("#cs4all");

T2.tweeted("#algorithms");

test(T2.popularity("#algorithms") == 2);

test(T2.popularity("#cs4all") == 3);

test(T2.popularity("#programming") == 5);

test(T2.popularity("#C++") == 4);

// Enforce no usage of global variables

test(T1.popularity("#algorithms") == 1);

test(T1.popularity("#cs4all") == 2);

test(T1.popularity("#programming") == 3);

test(T1.popularity("#C++") == 0);

// Test top_trend(), top_three_trends()

Trendtracker T3("small.txt");

T3.top_three_trends(R);

test(R.size() == 3);

T3.tweeted("#programming");

test(T3.top_trend() == "#programming");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#programming");

T3.tweeted("#C++");

test(T3.top_trend() == "#C++");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#C++");

test(R[1] == "#programming");

T3.tweeted("#algorithms");

test(T3.top_trend() == "#algorithms");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#algorithms");

test(R[1] == "#C++");

test(R[2] == "#programming");

T3.tweeted("#cs4all");

test(T3.top_trend() == "#cs4all");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#cs4all");

test(R[1] == "#algorithms");

test(R[2] == "#C++");

// At this point:

// cs4all: 4

// algorithms: 3

// C++: 2

// programming: 1

T3.tweeted("#programming");

test(T3.top_trend() == "#programming");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#programming");

test(R[1] == "#cs4all");

test(R[2] == "#algorithms");

// At this point:

// programming: 5

// cs4all: 4

// algorithms: 3

// C++: 2

T3.tweeted("#cs4all");

T3.tweeted("#algorithms");

test(T3.top_trend() == "#cs4all");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#cs4all");

test(R[1] == "#programming");

test(R[2] == "#algorithms");

// At this point:

// cs4all: 6

// programming: 5

// algorithms: 4

// C++: 2

for (int i = 0; i < 10000; ++i)

T3.tweeted("#C++");

test(T3.top_trend() == "#C++");

T3.top_three_trends(R);

test(R.size() == 3);

test(R[0] == "#C++");

test(R[1] == "#cs4all");

test(R[2] == "#programming");

Trendtracker T4("hashtags.txt");

test(T4.size() == 300000);

ifstream f;

f.open("tweeted.txt");

assert(f.is_open()); // If this fails, you're missing tweeted.txt

while (getline(f, line))

T4.tweeted(line);

f.close();

test(T4.popularity("#programming") == 10);

test(T4.popularity("#computer") == 9);

test(T4.popularity("#is") == 8);

test(T4.popularity("#very") == 7);

test(T4.popularity("#fun") == 6);

test(T4.popularity("#but") == 5);

test(T4.popularity("#sometimes") == 5);

test(T4.popularity("#can") == 5);

test(T4.popularity("#be") == 5);

test(T4.popularity("#challenging") == 5);

test(T4.top_trend() == "#programming");

T4.top_three_trends(R);

test(R[0] == "#programming");

test(R[1] == "#computer");

test(R[2] == "#is");

// Test a Trendtracker with a single hashtag

Trendtracker T5("tiny.txt");

test(T5.size() == 1);

test(T5.popularity("#solo") == 0);

test(T5.popularity("#duo") == -1);

T5.tweeted("#solo");

test(T5.popularity("#solo") == 1);

test(T5.popularity("#duo") == -1);

test(T5.top_trend() == "#solo");

T5.top_three_trends(R);

test(R.size() == 1);

test(R[0] == "#solo");

cout << "Assignment complete." << endl;

}

/********************* trendtracker.h *************************/

#ifndef TRENDTRACKER_H

#define TRENDTRACKER_H

#include <cassert>

#include <fstream>

#include <vector>

#include <string>

using namespace std;

class Trendtracker

{

// For the mandatory running times below:

// n is the number of hashtags in the Trendtracker.

public:

// Creates a Trendtracker containing hashtags

// found in the provided file.

// The file is promised to have the following format:

// string1

// string2

// ...

// stringN

// where string1 < string2 < ... < stringN

// Must run in O(n) time.

Trendtracker(string filename);

// Return the number of hashtags in the Trendtracker.

// Must run in O(1) time.

int size();

// Adds 1 to the total number times a hashtag has been tweeted.

// If the hashtag does not exist in TrendTracker, does nothing.

// Must run in O(log(n)) time.

void tweeted(string ht);

// Returns the number of times a hashtag has been tweeted.

// If the hashtag does not exist in Trendtracker, returns -1.

// Must run in O(log(n)) time.

int popularity(string name);

// Returns a most-tweeted hashtag.

// If the Trendtracker has no hashtags, returns "".

// Must run in O(1) time.

string top_trend();

// Fills the provided vector with the 3 most-tweeted hashtags,

// in order from most-tweeted to least-tweeted.

// If there are fewer than 3 hashtags, then the vector is filled

// with all hashtags (in most-tweeted to least-tweeted order).

// Must run in O(1) time.

void top_three_trends(vector<string> &T);

private:

// A simple class representing a hashtag and

// the number of times it has been tweeted.

class Entry

{

public:

string hashtag;

int pop;

};

// Optional helper method.

// Returns the index of E containing an Entry with hashtag ht.

// If no such hashtag is found, returns -1.

// Should run in O(log(n)).

int search(string ht);

// Entries sorted (lexicographically) by hashtag.

vector<Entry> E;

// Stores indices of the (up to) three most-tweeted

// entries in E.

vector<int> S;

};

#endif

//******************** trendtracker.cpp ******************************/

#include "trendtracker.h"

#include <iostream>

using namespace std;

/*************************************************************/

// Creates a Trendtracker containing hashtags

// found in the provided file.

// The file is promised to have the following format:

// string1

// string2

// ...

// stringN

// where string1 < string2 < ... < stringN

Trendtracker::Trendtracker(string filename)

{

}

/*************************************************************/

// Return the number of hashtags in the Trendtracker.

// Must run in O(1) time.

int Trendtracker::size()

{

return E.size();

}

/*************************************************************/

// Adds 1 to the total number times a hashtag has been tweeted.

// If the hashtag does not exist in TrendTracker, does nothing.

// Must run in O(log(n)) time. <--------------

void tweeted(string ht)

{

}

/*************************************************************/

// Returns the number of times a hashtag has been tweeted.

// If the hashtag does not exist in Trendtracker, returns -1.

// Must run in O(log(n)) time.

int popularity(string name)

{

}

/*************************************************************/

/// Returns a most-tweeted hashtag.

// If the Trendtracker has no hashtags, returns "".

// Must run in O(1) time.

string top_trend()

{

}

/*************************************************************/

// Fills the provided vector with the 3 most-tweeted hashtags,

// in order from most-tweeted to least-tweeted.

// If there are fewer than 3 hashtags, then the vector is filled

// with all hashtags (in most-tweeted to least-tweeted order).

// Must run in O(1) time.

void top_three_trends(vector<string> &T)

{

}

Explanation / Answer

main.cpp

#include <cassert>
#include <fstream>
#include <iostream>
#include <cstdlib>
#include <string>
#include "trendtracker.h"

using namespace std;

inline void _test(const char* expression, const char* file, int line)
{
    cerr << "test(" << expression << ") failed in file " << file;
    cerr << ", line " << line << "." << endl;
    abort();
}

#define test(EXPRESSION) ((EXPRESSION) ? (void)0 : _test(#EXPRESSION, __FILE__, __LINE__))

int main()
{
    // Setup
    vector<string> R;
    string s, line;


    // Test size() and insert().
    Trendtracker T1;
    test(T1.size() == 0);
    test(T1.popularity("#algorithms") == -1);
    test(T1.popularity("#cs4all") == -1);
    test(T1.popularity("#programming") == -1);

    T1.insert("#cs4all");
    test(T1.size() == 1);
    test(T1.popularity("#algorithms") == -1);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == -1);

    T1.insert("#algorithms");
    test(T1.size() == 2);
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == -1);

    T1.insert("#programming");
    test(T1.size() == 3);
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == 0);

    T1.insert("#algorithms");
    test(T1.size() == 3);
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == 0);

    T1.tweeted("#programming");
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == 1);

    T1.tweeted("#programming");
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == 2);

    T1.tweeted("#programming");
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 0);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#cs4all");
    test(T1.popularity("#algorithms") == 0);
    test(T1.popularity("#cs4all") == 1);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#algorithms");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 1);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#cs4all");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == -1);
    test(T1.popularity("#programming") == 3);

    T1.insert("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 0);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 1);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 2);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 3);
    test(T1.popularity("#programming") == 3);

    T1.tweeted("#datastructures");
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 4);
    test(T1.popularity("#programming") == 3);


    Trendtracker T2;
    T2.insert("#3333");
    T2.insert("#programming");
    T2.insert("#cs4all");
    T2.insert("#C++");
    T2.insert("#algorithms");
    T2.tweeted("#programming");
    T2.tweeted("#programming");
    T2.tweeted("#programming");
    T2.tweeted("#programming");
    T2.tweeted("#programming");
    T2.tweeted("#C++");
    T2.tweeted("#C++");
    T2.tweeted("#C++");
    T2.tweeted("#C++");
    T2.tweeted("#cs4all");
    T2.tweeted("#cs4all");
    T2.tweeted("#cs4all");
    T2.tweeted("#algorithms");
    T2.tweeted("#algorithms");
    T2.tweeted("#3333");
    test(T2.popularity("#programming") == 5);
    test(T2.popularity("#cs4all") == 3);
    test(T2.popularity("#algorithms") == 2);
    test(T2.popularity("#C++") == 4);
    test(T2.popularity("#3333") == 1);
    T2.insert("#3333");
    T2.insert("#programming");
    T2.insert("#cs4all");
    T2.insert("#C++");
    T2.insert("#algorithms");
    test(T2.popularity("#programming") == 5);
    test(T2.popularity("#cs4all") == 3);
    test(T2.popularity("#algorithms") == 2);
    test(T2.popularity("#C++") == 4);
    test(T2.popularity("#3333") == 1);


    // Enforce no usage of global variables
    test(T1.popularity("#algorithms") == 1);
    test(T1.popularity("#cs4all") == 2);
    test(T1.popularity("#datastructures") == 4);
    test(T1.popularity("#programming") == 3);


    Trendtracker T3;
    test(T3.top_trend() == "");
    T3.top_three_trends(R);
    test(R.size() == 0);

    T3.insert("#programming");
    test(T3.top_trend() == "#programming");
    T3.top_three_trends(R);
    test(R.size() == 1);
    test(R[0] == "#programming");

    T3.tweeted("#programming");
    test(T3.top_trend() == "#programming");
    T3.top_three_trends(R);
    test(R.size() == 1);
    test(R[0] == "#programming");


    T3.insert("#C++");
    T3.tweeted("#C++");
    T3.tweeted("#C++");
    test(T3.top_trend() == "#C++");
    T3.top_three_trends(R);
    test(R.size() == 2);
    test(R[0] == "#C++");
    test(R[1] == "#programming");


    T3.insert("#3333");
    T3.tweeted("#3333");
    T3.tweeted("#3333");
    T3.tweeted("#3333");
    test(T3.top_trend() == "#3333");
    T3.top_three_trends(R);
    test(R.size() == 3);
    test(R[0] == "#3333");
    test(R[1] == "#C++");
    test(R[2] == "#programming");


    T3.insert("#cs4all");
    T3.tweeted("#cs4all");
    T3.tweeted("#cs4all");
    T3.tweeted("#cs4all");
    T3.tweeted("#cs4all");
    test(T3.top_trend() == "#cs4all");
    T3.top_three_trends(R);
    test(R.size() == 3);
    test(R[0] == "#cs4all");
    test(R[1] == "#3333");
    test(R[2] == "#C++");


    T3.tweeted("#programming");
    T3.tweeted("#programming");
    T3.tweeted("#programming");
    T3.tweeted("#programming");
    test(T3.top_trend() == "#programming");
    T3.top_three_trends(R);
    test(R.size() == 3);
    test(R[0] == "#programming");
    test(R[1] == "#cs4all");
    test(R[2] == "#3333");


    T3.tweeted("#cs4all");
    T3.tweeted("#cs4all");
    T3.tweeted("#3333");
    test(T3.top_trend() == "#cs4all");
    T3.top_three_trends(R);
    test(R.size() == 3);
    test(R[0] == "#cs4all");
    test(R[1] == "#programming");
    test(R[2] == "#3333");

    for (int i = 0; i < 10000; ++i)
        T3.tweeted("#C++");
    test(T3.top_trend() == "#C++");
    T3.top_three_trends(R);
    test(R.size() == 3);
    test(R[0] == "#C++");
    test(R[1] == "#cs4all");
    test(R[2] == "#programming");



    Trendtracker T4;

    ifstream f;
    f.open("common.txt");
    assert(f.is_open()); // If this fails, you're missing common.txt
    while (getline(f, line))
        T4.insert(line);
    f.close();
    test(T4.size() == 3597);

    f.open("common.txt");
    while (getline(f, line))
        T4.tweeted(line);
    f.close();

    for (int i = 0; i < 1000; ++i)
    {
        test(T4.popularity("#finishing") == 6);
        test(T4.popularity("#completely") == 5);
        test(T4.popularity("#is") == 4);
        test(T4.popularity("#sometimes") == 3);
        test(T4.popularity("#quieting") == 2);

        test(T4.top_trend() == "#finishing");

        T4.top_three_trends(R);
        test(R[0] == "#finishing");
        test(R[1] == "#completely");
        test(R[2] == "#is");
    }


    cout << "Assignment complete." << endl;
}

trendtracker.cpp

#include "trendtracker.h"
#include <iostream>
using namespace std;

/*************************************************************/

Trendtracker::Trendtracker()
{

}

/*************************************************************/

// Inserts a hashtag (tweeted 0 times) into the Trendtracker.
// If the hashtag already is in Trendtracker, does nothing.
void Trendtracker::insert(string ht)
{
    Entry trend;
    int i, n = E.size();
    trend.hashtag = ht;
    trend.pop = 0;
    for (i = 0; i < n; i++) {
        if (ht == E[i].hashtag) {
            break;
        }
    }
    if(i == n)
        E.push_back(trend);
    //Push the element only if i is equal to n, that is there was no instance of the hastag to be inserted
}

/*************************************************************/

// Return the number of hashtags in the Trendtracker.
int Trendtracker::size()
{
return E.size();
}

/*************************************************************/

// Inserts a hashtag (tweeted 0 times) into the Trendtracker.
// If the hashtag already is in Trendtracker, does nothing.
void Trendtracker::tweeted(string ht) {
    int n = E.size();
    for (int i = 0; i < n; i++) {
        if (ht == E[i].hashtag) {
            E[i].pop++;
            break;
            // Breaks if required match found
        }
    }
}

/*************************************************************/

// Returns the number of times a hashtag has been tweeted.
// If the hashtag does not exist in Trendtracker, returns -1.
int Trendtracker::popularity(string name)
{
    int i = 0;
    int n = E.size();
    bool check = 0;

    for (i = 0; i < n; i++) {
        if (name == E[i].hashtag) {
            check = 1;
            break;
        }
    }

    if (check == 1) {
        return E[i].pop;
    }
    else {
        return -1;
    }
}

/*************************************************************/

// Returns a most-tweeted hashtag.
// If the Trendtracker has no hashtags, returns "".
string Trendtracker::top_trend()
{
    if(size() == 0)
        return "";
    //return an empty string if empty

    int i, n, popular;

    //loops through Trendtracker checking for the hashtag with most tweets
    for (i = 1, n = E.size(), popular = 0; i < n; i++) {
        if (E[i].pop > E[popular].pop)
            popular = i;
    }
    return E[popular].hashtag;
}
void Trendtracker::top_three_trends(vector<string>& T)
{
    T.clear();
    //Clears the vector for further use
    if(size() == 0)
        return;
    //Returns if trends are empty
    int n = E.size();
    Entry dummy = {"", -1};
    E.push_back(dummy);
    //Create a dummy entry with a negative value and assume its the largest
    //first, second and third point to it

    int i, j, first, second, third;
    for (i = 0, first = second = third = n; i < n; i++) {
        if(E[i].pop > E[first].pop) {
            third = second;
            second = first;
            first = i;
        } else if(E[i].pop > E[second].pop) {
            third = second;
            second = i;
        } else if(E[i].pop > E[third].pop) {
            third = i;
        }
    }

    T.push_back(E[first].hashtag);
    if(second != n && second != first)
        T.push_back(E[second].hashtag);
    if(third != n && third != second)
        T.push_back(E[third].hashtag);
    //Check if the pointers still point to the dummy variable
    //insert only if it doesn't
    E.pop_back();
    //Remove the dummy element
}

trendtracker.h

#ifndef TRENDTRACKER_H
#define TRENDTRACKER_H

#include <vector>
#include <string>

using namespace std;

class Trendtracker
{
    // For the mandatory running times below:
    // n is the number of hashtags in the Trendtracker.

public:
    // Creates a new Trendtracker tracking no hashtags.
    //
    // Must run in O(1) time.
    Trendtracker();

    // Inserts a hashtag (tweeted 0 times) into the Trendtracker.
    // If the hashtag already is in Trendtracker, does nothing.
    //
    // Must run in O(n) time.
    void insert(string ht);

    // Return the number of hashtags in the Trendtracker.
    //
    // Must run in O(1) time.
    int size();

    // Adds 1 to the total number times a hashtag has been tweeted.
    // If the hashtag does not exist in TrendTracker, does nothing.
    //
    // Must run in O(n) time.
    void tweeted(string ht);

    // Returns the number of times a hashtag has been tweeted.
    // If the hashtag does not exist in Trendtracker, returns -1.
    //
    // Must run in O(n) time.
    int popularity(string name);

    // Returns a most-tweeted hashtag.
    // If the Trendtracker has no hashtags, returns "".
    //
    // Must run in O(n) time.
    string top_trend();

    // Fills the provided vector with the 3 most-tweeted hashtags,
    // in order from most-tweeted to least-tweeted.
    //
    // If there are fewer than 3 hashtags, then the vector is filled
    // with all hashtags (in most-tweeted to least-tweeted order).
    //
    // Must run in O(n) time.
    void top_three_trends(vector<string> &T);

private:
    // A simple class representing a hashtag and
    // the number of times it has been tweeted.
    class Entry
    {
    public:
        string hashtag;
        int pop;
    };


    // Entries containing each hashtag and its popularity.
    vector<Entry> E;
};

#endif

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