Day 1

d1/main.cxx

@@ -1,15 +1,56 @@
 #include <iostream>
-#include <fstream>
+#include <sstream>
+#include <vector>
+#include <unordered_map>
+#include <algorithm>
 
 using std::cout, std::endl;
 
-int main() {
-    std::ifstream file{"../d1/input.txt"};
-    std::string line;
+constexpr const char content[] = {
+    #embed "input.txt"
+};
 
-    while (std::getline(file, line)) {
-        
+void part_1() {
+    std::vector<int> left_vec, right_vec;
+    std::istringstream iss{content}; 
+
+    int l_id, r_id;
+    while (iss >> l_id >> r_id) {
+        left_vec.emplace_back(l_id);
+        right_vec.emplace_back(r_id);
     }
-    
+    std::sort(left_vec.begin(), left_vec.end());
+    std::sort(right_vec.begin(), right_vec.end());
+
+    auto diff_acc{0};
+    for (auto i{0}; i < left_vec.size(); i++) {
+        diff_acc += std::abs(left_vec[i] - right_vec[i]);
+    }
+
+    cout << diff_acc << endl;
+}
+
+void part_2() {
+    std::vector<int> left_vec;
+    std::unordered_map<int, int> right_map;
+    std::istringstream iss{content}; 
+
+    int l_id, r_id;
+    while (iss >> l_id >> r_id) {
+        left_vec.emplace_back(l_id);
+        right_map[r_id]++;
+    }
+
+    auto sim_acc{0};
+    for (auto left_num : left_vec) {
+        sim_acc += right_map[left_num] * left_num;
+    }
+
+    cout << sim_acc << endl;
+} 
+
+int main() {
+    part_1();
+    part_2();
     return 0;
 }