Working Days Lab

INPUT.TXT

4
15.01. 17:00
16.01. 12:00
11.02. 14:00
30.01. 10:00

main.cpp

#include <iostream>
#include <cstdlib>
#include <string>
#include <fstream>
#include <iomanip>
#include <chrono>

using namespace std;

typedef chrono::time_point<chrono::system_clock> time_point;

const char *INPUT_FILENAME = "./INPUT.TXT"; // For Windows OS maybe you need to remove leading './'
const char *OUTPUT_FILENAME = "./OUTPUT.TXT"; // For Windows OS maybe you need to remove leading './'

const int DAY_START = 10;
const int DAY_END = 18;

chrono::minutes get_work_time(time_point &t1, time_point &t2);

/**
 * You must place input file to run directory.
 * Output will be placed in the same folder.
 *
 * Compiler: GCC C++14, Linux OS
 */
int main() {

    ifstream input(INPUT_FILENAME);

    // Read count
    string line;
    getline(input, line);
    int point_count = stoi(line);
    cout << "Time points:" << point_count << endl;

    // Read all time points to dynamic array
    auto time_points = new time_point[point_count];
    tm time_buffer = {};
    time_t timer = time(nullptr); // Now time
    time_buffer.tm_year = localtime(&timer)->tm_year; // Set current 2019 year (not leap) to buffer

    for (int i = 0; i < point_count; ++i) {
        if (getline(input, line)) {

            istringstream iss(line);
            iss >> get_time(&time_buffer, "%d.%m. %H:%M");
            cout << "Read point " << put_time(&time_buffer, "%c") << endl;
            time_points[i] = chrono::system_clock::from_time_t(mktime(&time_buffer));
        } else {
            exit(EXIT_FAILURE); // Something went wrong
        }
    }

    // Sort time points from early to late
    qsort(time_points, point_count, sizeof(*time_points), [](const void *a, const void *b) {
        // Closure (anonymous function) with custom sorting logic
        time_point arg1 = *static_cast<const time_point *>(a);
        time_point arg2 = *static_cast<const time_point *>(b);
        return arg1.time_since_epoch().count() > arg2.time_since_epoch().count() ? 1 : -1; // 1 - a > b, -1 b > a, 0 = objects are equals
    });

    // Concatenate all work periods
    chrono::minutes overall(0);
    for (int i = 0; i < point_count; i += 2) {
        chrono::minutes work_time = get_work_time(time_points[i], time_points[i + 1]);
        overall += work_time;
    }

    delete[] time_points; // Clear dynamic memory after use

    // Print results
    long minutes = overall.count();
    long hourMinutes = minutes % 60;
    cout << "Overall: " << minutes / 60 << ":";
    if (hourMinutes < 10) cout << "0" << hourMinutes << endl;
    else cout << hourMinutes << endl;

    // Write results to file
    remove(OUTPUT_FILENAME);
    ofstream output(OUTPUT_FILENAME);
    output << minutes / 60 << ":";
    if (hourMinutes < 10) output << "0" << hourMinutes;
    else output << hourMinutes;
    output.close();

    return EXIT_SUCCESS;
}

chrono::minutes get_work_time(time_point &t1, time_point &t2) {

    time_t tt = chrono::system_clock::to_time_t(t1);
    tm start = *localtime(&tt);
    tt = chrono::system_clock::to_time_t(t2);
    tm end = *localtime(&tt);
    long days = end.tm_yday - start.tm_yday + 1;

    cout << "days in period " << days << endl;
    cout << "from " << put_time(&start, "%c") << " to " << put_time(&end, "%c") << endl;
    if (days == 1) {
        auto result = chrono::duration_cast<chrono::minutes>(t2 - t1 + chrono::minutes(1));
        cout << "add period for single working day" << result.count() / 60 << ":" << result.count() % 60 << endl;
        return result;
    } else {
        chrono::minutes result = chrono::minutes(1);
        if (days > 2) {
            cout << "add full working days " << (days - 2) * 8 << ":00" << endl;
            result += chrono::hours(8 * (days - 2)); // Add full working days if existing
        }
        result += chrono::minutes(DAY_END * 60 - start.tm_hour * 60 - start.tm_min); // Add first day of period;
        result += chrono::minutes(end.tm_hour * 60 + end.tm_min - DAY_START * 60); // Add last day of period
        return result;
    }
}

OUTPUT.TXT

103:02