do day 5

input/2025-5.sample.txt

@@ -0,0 +1,11 @@
+3-5
+10-14
+16-20
+12-18
+
+1
+5
+8
+11
+17
+32

src/day5.cpp

@@ -0,0 +1,78 @@
+// :autocmd BufWritePost *.cpp :silent exec "!./build 5"
+#include <algorithm>
+#include <cstdint>
+#include <fstream>
+#include <iostream>
+#include <string>
+#include <vector>
+
+struct Range {
+  int64_t min;
+  int64_t max;
+};
+
+constexpr int compare(const Range &a, const Range &b) {
+  if (a.min == b.min) {
+    return a.max < b.max;
+  }
+  return a.min < b.min;
+}
+
+using Ranges = std::vector<Range>;
+using Nums = std::vector<int64_t>;
+
+int64_t part_1(const Ranges &ranges, const Nums &nums);
+int64_t part_2(const Ranges &ranges, const Nums &nums);
+
+int main() {
+  std::ifstream file{"input/2025-5.txt"};
+  std::string line;
+
+  Ranges ranges;
+  char throwaway;
+  while (std::getline(file, line) && line != "") {
+    Range r{};
+    sscanf(line.c_str(), "%ld-%ld", &r.min, &r.max);
+    ranges.push_back(r);
+  }
+
+  int64_t num;
+  Nums nums{};
+  while (file >> num) {
+    nums.push_back(num);
+  }
+  std::sort(ranges.begin(), ranges.end(), compare);
+
+  std::cout << "Part 1: " << part_1(ranges, nums) << std::endl;
+  std::cout << "Part 2: " << part_2(ranges, nums) << std::endl;
+}
+
+int64_t part_1(const Ranges &ranges, const Nums &nums) {
+  int64_t ans{};
+  for (auto num : nums) {
+    for (auto range : ranges) {
+      if (num >= range.min && num <= range.max) {
+        ans += 1;
+        break;
+      }
+    }
+  }
+  return ans;
+}
+
+int64_t part_2(const Ranges &ranges, const Nums &nums) {
+  int64_t ans{};
+  int64_t scanner{0};
+  for (auto range : ranges) {
+    if (scanner < range.min) {
+      auto temp{range.max - range.min + 1};
+      ans += temp;
+      scanner = range.max;
+    } else if (scanner <= range.max) {
+      auto temp{range.max - scanner};
+      ans += temp;
+      scanner = range.max;
+    }
+  }
+  return ans;
+}