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jobs.cpp
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jobs.cpp
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#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <algorithm>
#include <time.h>
using namespace std;
bool compareDifference(pair <int,int> p1, pair <int, int> p2)
{
int diff1 = p1.first - p1.second;
int diff2 = p2.first - p2.second;
if (diff1 == diff2)
return p1.first > p2.first;
else
return diff1 > diff2;
}
bool compareRatio(pair <int, int> p1, pair <int, int> p2)
{
return (float)p1.first/(float)p1.second > (float)p2.first / (float)p2.second;
}
int main()
{
vector<pair<int, int>> input;
string line;
ifstream myfile("jobs.txt");
clock_t start = clock();
if (myfile.is_open())
{
int first, second;
getline(myfile, line);
while (getline(myfile, line))
{
int i = 0;
int current_int = 0;
while (i < line.size())
{
if (line[i] == ' ')
{
first = current_int;
current_int = 0;
i++;
}
current_int = current_int * 10 + (line[i] - '0');
i++;
}
second = current_int;
input.push_back(pair<int, int>(first, second));
}
myfile.close();
}
else
{
cout << "Unable to open file";
}
clock_t end = clock();
cout << "File reading took " << double(end - start) / CLOCKS_PER_SEC << " seconds.\n";
start = clock();
sort(input.begin(), input.end(), compareDifference);
unsigned long long sum = 0;
unsigned long long time = 0;
for (int i = 0; i < input.size(); i++)
{
time += (unsigned long long)input[i].second;
sum += (unsigned long long)input[i].first * time;
}
end = clock();
cout << "Weighted sum (greedy differences): " << sum <<"\n";
cout << "That took " << double(end - start) / CLOCKS_PER_SEC << " seconds.\n";
start = clock();
sort(input.begin(), input.end(), compareRatio);
sum = 0;
time = 0;
for (int i = 0; i < input.size(); i++)
{
time += (unsigned long long)input[i].second;
sum += (unsigned long long)input[i].first * time;
}
end = clock();
cout << "Weighted sum (greedy ratio): " << sum << "\n";
cout << "That took " << double(end - start) / CLOCKS_PER_SEC << " seconds.\n";
cout << "Hello World!\n";
}