TRENDTRACKER.H

#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 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 &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 E; };

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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 << "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 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");

// At this point: // programming: 1

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");

// At this point: // C++: 2 // programming: 1

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");

// At this point: // 3333: 3 // C++: 2 // programming: 1

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++"); // At this point: // cs4all: 4 // 3333: 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] == "#3333");

// At this point: // programming: 5 // cs4all: 4 // 3333: 3 // C++: 2

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"); // At this point: // cs4all: 6 // programming: 5 // 3333: 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;

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; }

I need help implementing the last function top_three_trends(vector &T), such that my program prints "Assignment Complete."

// 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 &T);