advent-of-code

commit dc599a59c59e0fa7bbadb17d9a15c5d526dc81e8
parent 93d505b108c52ec78824ff88c60c4960ed715e65
Author: Shimmy Xu <shimmy.xu@shimmy1996.com>
Date:   Sun,  1 Dec 2019 23:39:29 -0500

Add Makefile and C++ solution

Diffstat:
A
day-01/Makefile
 | 
13
+++++++++++++
A
day-01/day-01.cc
 | 
34
++++++++++++++++++++++++++++++++++

2 files changed, 47 insertions(+), 0 deletions(-)
diff --git a/day-01/Makefile b/day-01/Makefile
@@ -0,0 +1,13 @@
+CC := g++
+CCFLAGS := --std=c++17 -Wall
+
+all: day-01-cpp day-01-rust day-01.jl
+	julia day-01.jl
+	./day-01-cpp
+	./day-01-rust
+
+day-01-cpp: day-01.cc
+	$(CC) $(CCFLAGS) $^ -o $@
+
+day-01-rust: day-01.rs
+	rustc $^ -o $@
diff --git a/day-01/day-01.cc b/day-01/day-01.cc
@@ -0,0 +1,34 @@
+#include <fstream>
+#include <iostream>
+#include <numeric>
+#include <vector>
+
+auto part_1(std::vector<int>& masses) -> int {
+  return std::accumulate(
+      masses.begin(), masses.end(), 0,
+      [](auto acc, auto mass) { return acc + mass / 3 - 2; });
+}
+
+auto part_2(std::vector<int>& masses) -> int {
+  return std::accumulate(masses.begin(), masses.end(), 0,
+                         [](auto acc, auto mass) {
+                           while (mass > 0) {
+                             mass = mass / 3 - 2;
+                             acc += mass;
+                           }
+                           return acc;
+                         });
+}
+
+auto main() -> int {
+  auto input_file = std::ifstream("input.txt");
+  auto input = std::vector<int>{};
+  int x;
+  while (input_file >> x) {
+    input.push_back(x);
+  }
+
+  std::cout << "C++17:\n"
+            << "Part 1: " << part_1(input) << "\nPart 2: " << part_2(input)
+            << std::endl;
+}