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#include <iostream>
#include <cstdlib>
#include <fstream>
#include <string>
#include <sstream>
using namespace std;
struct element {
string name;
double weight;
double value;
double evaluateRatio() {
return value / weight;
}
string formatString() {
stringstream ss;
ss << name << " w: " << weight << " v: " << value;
return ss.str();
}
};
void sortItems(element*&, int&, int&);
void selectItems(element*&, int&, element*&, int&, double&);
bool inArray(element*&, int&, element&);
int main() {
ifstream inputFile;
string fileName;
int arraySize, count;
element tmpEl;
element* elArray;
count = 0;
cout << "Enter the name of the input file:" << endl;
cin >> fileName;
inputFile.open(fileName.c_str());
if(!inputFile.is_open()) {
cout << "Error opening file... Exiting now" << endl;
exit(EXIT_FAILURE);
}
inputFile >> arraySize;
elArray = new element[arraySize];
while(inputFile >> tmpEl.name >> tmpEl.weight >> tmpEl.value) {
elArray[count++] = tmpEl;
}
cout << endl << "input:" << endl;
for(int i = 0; i < count; ++i) {
cout << elArray[i].formatString() << endl;
}
sortItems(elArray, arraySize, count);
cout << endl << "Sorted input by value / weight ratio:" << endl;
for(int i = 0; i < count; ++i) {
cout << elArray[i].formatString() << endl;
}
double usrIn = 0;
element* targetArray = new element[arraySize];
int targetCount;
double wght, vlue;
while(usrIn >= 0) {
wght = 0;
vlue = 0;
cout << endl << "Enter target maximum weight (negative to exit): ";
cin >> usrIn;
if(usrIn >= 0) {
selectItems(elArray, count, targetArray, targetCount, usrIn);
cout << endl << "The best approximation for value and given weight is: " << endl << endl;
for(int i = 0; i < targetCount; ++i) {
cout << targetArray[i].formatString() << endl;
wght += targetArray[i].weight;
vlue += targetArray[i].value;
}
cout << endl << "weight: " << wght << endl << "value: " << vlue << endl;
}
}
return 0;
}
void sortItems(element* &elArr, int &maxSize, int &count) {
element* tmpArr = new element[maxSize];
element tmpEl;
for(int i = 0; i < count; ++i) {
for(int j = 0; j < count; ++j) {
if(!inArray(tmpArr, i, elArr[j])) {
tmpEl = elArr[j];
}
}
for(int j = 0; j < count; ++j) {
if(!inArray(tmpArr, i, elArr[j]) && elArr[j].evaluateRatio() > tmpEl.evaluateRatio()) {
tmpEl = elArr[j];
}
}
tmpArr[i] = tmpEl;
}
delete[] elArr;
elArr = tmpArr;
}
void selectItems(element* &elArr, int &count, element* &output, int &outCount, double &tarWeight) {
outCount = 0;
for(int i = 0; i < count; ++i) {
if(elArr[i].weight < tarWeight) {
output[outCount++] = elArr[i];
tarWeight -= elArr[i].weight;
}
}
}
bool inArray(element* &elArr, int &count, element &el) {
for(int i = 0; i < count; ++i) {
if(elArr[i].name == el.name) {
return true;
}
}
return false;
}
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