I'm not sure why I'm awake, so I'll do this tomorrow.

2024/7/Makefile

@@ -0,0 +1,2 @@
+a.out: main.cpp
+	clang++ -std=c++2b -g -O0 main.cpp

2024/7/data_test.txt

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+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20

2024/7/main.cpp

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+#include <fstream>
+#include <iostream>
+#include <set>
+#include <sstream>
+#include <string>
+#include <vector>
+
+int main()
+{
+	std::ifstream ifs("data_test.txt");
+	if(!ifs.is_open())
+	{
+		std::cerr << "Missing data.txt." << std::endl;
+		return -1;
+	}
+
+	unsigned long total = 0;
+	unsigned long total_pt2 = 0;
+
+	std::vector<std::vector<long>> cals;
+
+	for(std::string line; std::getline(ifs, line); )
+	{
+		if(line == "")
+			continue;
+
+		cals.push_back({});
+		std::istringstream input(line);
+		// for each value in the line:
+		std::vector<long> nums;
+		for(std::string value; std::getline(input, value, ' '); )
+			cals.back().push_back(std::atoi(value.c_str()));
+	}
+
+	for(auto cal : cals)
+	{
+		for(auto num : cal)
+		{
+			std::cout << num << " ";
+		}
+		std::cout << std::endl;
+	}
+
+
+	std::cout << "    Total: " <<     total << std::endl;
+	std::cout << "PT2 Total: " << total_pt2 << std::endl;
+
+	return 0;
+}