Added older advents

advent_of_code_2018/day4/main1.cc

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+#include <algorithm>
+#include <ctime>
+#include <iomanip>
+#include <iostream>
+#include <map>
+#include <string>
+#include <vector>
+
+using namespace std;
+
+struct Event
+{
+    tm time;
+    string event;
+};
+
+istream &operator>>(istream &in, Event &event)
+{
+    char toss;
+    
+    in >> toss; // toss '['
+    in >> event.time.tm_year;
+    event.time.tm_year -= 1900;
+    in >> toss; // toss '-'
+    in >> event.time.tm_mon;
+    in >> toss; // toss '-'
+    in >> event.time.tm_mday;
+
+    in >> event.time.tm_hour;
+    in >> toss; // toss ':'
+    in >> event.time.tm_min;
+    in >> toss; // toss ']'
+
+    getline(cin, event.event);
+    return in;
+}
+
+ostream &operator<<(ostream &out, Event const &event)
+{
+    out << "Event: \n";
+    out << "    " << put_time(&event.time, "%c") << "\n";
+    out << "     - " << event.event << "\n";
+    return out;
+}
+
+int main()
+{
+    vector<Event> events;
+    map<int, int[60]> guards;
+
+    cout << setfill(' ');
+
+    while(!cin.eof())
+    {
+        Event event{};
+        cin >> event;
+        events.push_back(event);
+    }
+
+    std::sort(events.begin(), events.end(), 
+        [](Event &lhs, Event &rhs)
+        {
+            time_t l_time = mktime(&lhs.time);
+            time_t r_time = mktime(&rhs.time);
+
+            return l_time < r_time;
+        });
+
+    int current_id;
+    for (Event const &event : events)
+    {
+        size_t numstart = event.event.find("#");
+        if (numstart != string::npos)
+        {
+            size_t end = event.event.find(" ", numstart);
+            current_id = stoi(event.event.substr(numstart + 1, end - numstart - 1));
+        }
+
+        else if (event.event.find("asleep") != string::npos)
+        {
+            for (size_t idx = event.time.tm_min; idx != 60; ++idx)
+                ++guards[current_id][idx];
+        }
+
+        else if (event.event.find("wakes") != string::npos)
+        {
+            for (size_t idx = event.time.tm_min; idx != 60; ++idx)
+                --guards[current_id][idx];
+        }
+    }
+    
+    size_t max_id = 0;
+    size_t sleeper = 0;
+    
+    // cout << " Guard ID   Minute\n";
+    // cout << "                      1         2         3         4         5\n";
+    // cout << "            012345678901234567890123456789012345678901234567890123456789\n";
+    cout << "             ";
+    for (size_t idx = 0; idx != 60; ++idx)
+        cout << setw(3) << idx;
+    cout << " | total\n";
+
+    for (auto const &[id, sleep] : guards)
+    {
+        cout << "Guard " << setw(5) << id << ": ";
+        size_t total = 0;
+
+        for (int num : sleep)
+        {
+            cout << setw(3) << num;
+            total += num;
+        }
+        cout << " | " << total << "\n";
+
+
+        if (total > sleeper)
+        {
+            max_id = id;
+            sleeper = total;
+        }
+    }
+
+    cout << "Max sleeper: " << max_id << "\n";
+    
+    size_t min_id = 0;
+    sleeper = 0;
+    for (size_t idx = 0; idx != 60; ++idx)
+    {
+        if (guards[max_id][idx] > sleeper)
+        {
+            sleeper = guards[max_id][idx];
+            min_id = idx;
+        }
+    }
+
+    cout << "Slept most in minute " << min_id << ", for " << sleeper << " minutes.\n";
+
+    sleeper = 0;
+    min_id = 0;
+    size_t minute = 0;
+
+    for (auto const &[id, sleep] : guards)
+    {
+        for (size_t idx = 0; idx != 60; ++idx)
+        {
+            if (sleep[idx] >= sleeper)
+            {
+                sleeper = sleep[idx];
+                min_id = id;
+                minute = idx;
+            }
+        }
+    }
+
+    cout << "Guard " << min_id << " is most frequently asleep on minute ";
+    cout << minute << "\n";
+    cout << sleeper * minute << "\n";
+
+}