CPP Version of day 1 done.

cpp/day1/src/main.cpp

@@ -1,7 +1,89 @@
+#include <fstream>
 #include <iostream>
+#include <string>
+#include <vector>
+#include <stdexcept>
+#include <algorithm>
+
+struct Elf {
+public:
+    Elf()
+        : pocket({})
+    {
+    }
+
+    void add(uint64_t item)
+    {
+        pocket.push_back(item);
+    }
+
+    uint64_t getTotal() const
+    {
+        uint64_t total(0);
+        for (const auto& item : pocket)
+            total += item;
+        return total;
+    }
+
+    void clear()
+    {
+        pocket.clear();
+    }
+
+private:
+    std::vector<uint64_t> pocket;
+};
+
+std::ifstream open_file();
 
 int main()
 {
-    std::cout << "Bonjour Monde!" << std::endl;
+    std::ifstream file;
+    std::string file_content("");
+    std::vector<uint64_t> elvesTotal;
+
+    try
+    {
+        file = open_file();
+    } 
+    catch (...) 
+    {
+        std::cerr << "Could not open file." << std::endl;
+        return -1;
+    }
+
+    // Gathering each elf into the elves vector
+    Elf tempelf;
+    while (std::getline(file, file_content))
+    {
+        try {
+            tempelf.add(std::stoull(file_content));
+        }
+        catch(std::exception ex)
+        {
+            elvesTotal.push_back(tempelf.getTotal());
+            tempelf.clear();
+        }
+    }
+
+    std::sort(elvesTotal.begin(), elvesTotal.end() , [](uint64_t a, uint64_t b) { return a>b; });
+    std::cout << "Elf Max: " << *elvesTotal.begin() << std::endl;
+    uint64_t maxThree(0);
+    for(auto it = elvesTotal.begin() ; it != elvesTotal.end() ; it++)
+    {
+        maxThree += *it;
+        if(it == elvesTotal.begin()+2)
+            break;
+    }
+    std::cout << "Three elves total: " << maxThree << std::endl;
     return 0;
 }
+
+std::ifstream open_file()
+{
+    std::ifstream file;
+    file.open("elves");
+    if (!file.is_open())
+        throw -1;
+    return file;
+}