day 5

2025/aoc.cpp

@@ -12,6 +12,7 @@
 #include "day2.hpp"
 #include "day3.hpp"
 #include "day4.hpp"
+#include "day5.hpp"
 
 void GenerateDay(int day, std::filesystem::path base)
 {

2025/day5.hpp

@@ -0,0 +1,82 @@
+#pragma once
+#include "aoc.hpp"
+
+#include <set>
+
+class Day05 : public AOCDay
+{
+public:
+    Day05() {}
+    ~Day05() {}
+    int Day() override { return 5; }
+
+    std::vector<std::pair<uint64_t, uint64_t>> freshIDs;
+
+    uint64_t PartOne(File& f) override
+    {
+        bool ranges = true;
+        int ret = 0;
+        for (auto line : f.Lines())
+        {
+            if (line == "")
+            {
+                ranges = false;
+                continue;
+            }
+
+            if (ranges)
+            {
+                int dash = line.find('-', 0);
+                uint64_t a = std::stoll(line.substr(0, dash));
+                uint64_t b = std::stoll(line.substr(dash + 1));
+
+                freshIDs.push_back({a, b});
+            }
+            else
+            {
+                uint64_t foodStuff = std::stoll(line);
+                for (auto range : freshIDs)
+                {
+                    if (foodStuff >= range.first && foodStuff <= range.second)
+                    {
+                        ret++;
+                        break;
+                    }
+                }
+            }
+        }
+        return ret;
+    }
+
+    uint64_t PartTwo(File& f) override
+    {
+        // sort by first ID
+        std::sort(freshIDs.begin(), freshIDs.end());
+
+        uint64_t total = 0;
+        uint64_t curL = freshIDs[0].first;
+        uint64_t curR = freshIDs[0].second;
+
+        for (size_t i = 1; i < freshIDs.size(); i++)
+        {
+            auto [L, R] = freshIDs[i];
+
+            if (L > curR + 1)
+            {
+                total += (curR - curL + 1);
+                curL = L;
+                curR = R;
+            }
+            else
+            {
+                curR = std::max(curR, R);
+            }
+        }
+
+        total += (curR - curL + 1);
+
+        return total;
+    }
+};
+
+ADD_AOC_DAY(Day05);

2025/day6.hpp

@@ -0,0 +1,22 @@
+#pragma once
+#include "aoc.hpp"
+
+class Day06 : public AOCDay
+{
+public:
+    Day06() {}
+    ~Day06() {}
+    int Day() override { return 6; }
+
+    uint64_t PartOne(File& f) override
+    {
+        return 0;
+    }
+
+    uint64_t PartTwo(File& f) override
+    {
+        return 0;
+    }
+};
+
+ADD_AOC_DAY(Day06);