day 1

Makefile

@@ -0,0 +1,24 @@
+CXXFLAGS := -std=c++11 -Wall -Wextra -O2
+
+progs := $(patsubst %.cc,%,$(wildcard *.cc))
+
+.PHONY: all
+all: $(addsuffix _output.txt,$(progs))
+
+.PHONY: clean
+clean:
+	rm -f $(progs) $(addsuffix _test.txt,$(progs))
+
+.PHONY: ok-%
+ok-%: %_test.txt
+	@cp -v $< $*_output.txt
+
+.PHONY: test-%
+test-%: %_output.txt
+
+%_output.txt: %_test.txt
+	@test -f $@ || (echo $<:; cat $<)
+	@test -f $@ && (diff -u $@ $< && touch $@)
+
+$(addsuffix _test.txt,$(progs)): %_test.txt: %
+	./$< < $*_input.txt > $@

d01.cc

@@ -0,0 +1,41 @@
+#include <iostream>
+#include <vector>
+#include <algorithm>
+
+using namespace std;
+
+vector<unsigned> parse()
+{
+    vector<unsigned> elves;
+
+    string line;
+    unsigned elf = 0;
+    while (getline(cin, line)) {
+        if (line.empty()) {
+            elves.push_back(elf);
+            elf = 0;
+            continue;
+        }
+        elf += stoul(line);
+    }
+
+    sort(elves.begin(), elves.end(), greater<int>());
+    return elves;
+}
+
+unsigned p1(vector<unsigned> &input)
+{
+    return input[0];
+}
+
+unsigned p2(vector<unsigned> &input)
+{
+    return input[0] + input[1] + input[2];
+}
+
+int main()
+{
+    auto input = parse();
+    cout << p1(input) << endl;
+    cout << p2(input) << endl;
+}

d01_output.txt

@@ -0,0 +1,2 @@
+69836
+207968