Created the advent of code day 2 challenge (part 2)

aoc/02_part_2.cpp

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+#include <iostream>
+#include <fstream>
+#include <regex>
+
+using namespace std;
+
+// Advent of Code, Day 2 Part 2
+
+struct Set {
+    int red = 0;
+    int green = 0;
+    int blue = 0;
+};
+
+int main() {
+
+    fstream input("input.txt");
+
+    map<int, vector<Set>> games;
+
+    for (string line; getline(input, line);) {
+        regex e{"Game ([0-9]+): (.*)"};
+        smatch m;
+
+        if (regex_search(line, m, e) && m.size() <= 1) continue;
+        string id = m.str(1);
+        string setString = m.str(2);
+
+        vector<string> sets;
+
+        bool space = false;
+        string current_str;
+        for (char current: setString) {
+            if (current == ' ' && space) {
+                space = false;
+                sets.push_back(current_str);
+                current_str = "";
+                continue;
+            }
+
+            if (current == ';') {
+                space = true;
+                continue;
+            }
+
+            current_str.push_back(current);
+        }
+        sets.push_back(current_str);
+
+        vector<Set> list = {};
+
+        for (auto current: sets) {
+            regex set("([0-9]+) (blue|red|green)");
+
+            sregex_iterator iter(current.begin(), current.end(), set);
+            sregex_iterator end;
+
+            map<string, int> colors = {};
+
+            while (iter != end) {
+                colors[iter->str(2)] = stoi(iter->str(1));
+                iter++;
+            }
+
+            Set currentSet{};
+            currentSet.blue = colors["blue"];
+            currentSet.red = colors["red"];
+            currentSet.green = colors["green"];
+
+            list.push_back(currentSet);
+        }
+
+        games[stoi(id)] = list;
+    }
+
+
+    int sum = 0;
+
+    for (
+        auto game: games) {
+        vector<Set> bag = game.second;
+
+        int maxBlue = 0, maxGreen = 0, maxRed = 0;
+
+        for (auto set: bag) {
+            if (set.blue > maxBlue) maxBlue = set.blue;
+            if (set.green > maxGreen) maxGreen = set.green;
+            if (set.red > maxRed) maxRed = set.red;
+        }
+
+        int power = maxBlue * maxGreen * maxRed;
+
+        cout << "b: " << maxBlue << ",r: " << maxRed << ",g: " << maxGreen << "; POWER = " << power << endl;
+
+
+        sum += power;
+    }
+
+    cout << "sum => " << sum;
+
+    return 0;
+}