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//MAIN.CPP

#include #include #include #include #include #include "trendtracker.h"

using namespace std;

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

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

int main() { // Setup vector 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("#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"); 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++"); 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"); T3.tweeted("#algorithms"); 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"); 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] == "#algorithms"); test(R[2] == "#C++"); // At this point: // cs4all: 4 // algorithms: 3 // C++: 2 // programming: 1

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] == "#algorithms");

// At this point: // programming: 5 // cs4all: 4 // algorithms: 3 // C++: 2

T3.tweeted("#cs4all"); 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

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

//END MAIN.CPP

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//TRENDTRACKER.H

#ifndef TRENDTRACKER_H #define TRENDTRACKER_H

#include #include #include #include

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

// 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 &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 E;

// Stores indices of the (up to) three most-tweeted // entries in E. vector S; };

#endif

// END TRENDTRACKER.H

------------------------------------------------------------------

// TRENDTRACKER.CPP

#include "trendtracker.h"

// Creates a Trendtracker containing hashtags // found in the provided file. // The file is promised to have the following format: // // string1 // string2 // ... // stringN // // where string1 > line) { Entry sample; sample.hashtag = line; sample.pop = 0; E.push_back(sample); } }

// 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 Trendtracker::tweeted(string ht) { for (vector::size_type x = 0; x != E.size(); x++) { if (E[x].hashtag == ht) { E[x].pop++; return; } } }

// 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 Trendtracker::popularity(string name) { for (int i=0; i

return -1; }

// Returns a most-tweeted hashtag. // If the Trendtracker has no hashtags, returns "". // // Must run in O(1) time. 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 E[popular].pop) popular = i; } return E[popular].hashtag;

}

void Trendtracker::top_three_trends(vector &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 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();

}

// END TRENDTRACKER.CPP

---------------------------------------------------------

I need help implementing the functions in TRENDTRACKER.H such that my program prints "Assignment Complete."

In the previous homework, you implemented a Trendtracker data structure that tracks information about a set of hashtags. Unfortunately, the efficiency of data structure's operations (tweeted, popularity, top_three_trends, etc.) probably wasn't great. For tracking a few thousand hashtags, the efficiency was good cnough, but Twitter has hundreds of milions of users1 using millions of distinct hashtags.2 So for this homework, you will implement the same class, but using an efficient two-vector-based data structure (see Figure 1) vector S15 string hashtag vectorEntry> E 2- 8 |0-19-16 | 2 | int pop Figure 1: Representing hashtags and their popularitics using an efficient vector-based data structure