7 files changed, 50 insertions, 68 deletions

diff --git a/src/day04.cpp b/src/day04.cpp
index 8afcb2c..0d3e552 100644
--- a/src/day04.cpp
+++ b/src/day04.cpp
@@ -1,4 +1,3 @@
-#include <cctype>
 #include <fstream>
 #include <iostream>
 #include <set>
@@ -25,8 +24,8 @@ read_file(string_view filename)
 vector<string>
 split(const string& line, char sep)
 {
-        vector<string> parts{};
         stringstream   input{ line };
+        vector<string> parts;
 
         for ( string part; getline(input, part, sep); ) {
                 parts.emplace_back(part);
@@ -49,13 +48,12 @@ read_ints(const string& line)
         return container;
 }
 
-vector<unsigned long>
-build_data_set()
+auto
+build_data_set(string_view filename)
 {
-        const auto            lines = read_file("data/day04.txt");
-        vector<unsigned long> values{};
+        vector<unsigned long> values;
 
-        for ( const auto& line: lines ) {
+        for ( const auto& line: read_file(filename) ) {
                 const auto cards   = split(line, ':');
                 const auto numbers = split(cards[1], '|');
 
@@ -75,10 +73,10 @@ build_data_set()
 }
 
 void
-pass1()
+pass1(const vector<unsigned long>& values)
 {
         auto sum = 0U;
-        for ( auto value: build_data_set() ) {
+        for ( auto value: values ) {
                 if ( value != 0 ) {
                         sum += (1U << (value - 1));
                 }
@@ -88,10 +86,9 @@ pass1()
 }
 
 void
-pass2()
+pass2(const vector<unsigned long>& values)
 {
-        const auto values = build_data_set();
-        auto       count  = 0U;
+        auto count = 0U;
 
         function<void(size_t, size_t)> process = [&](size_t start, size_t end) -> void {
                 for ( ; start != end; ++start ) {
@@ -111,6 +108,7 @@ pass2()
 int
 main()
 {
-        pass1();
-        pass2();
+        const auto values = build_data_set("data/day04.txt");
+        pass1(values);
+        pass2(values);
 }
diff --git a/src/day05.cpp b/src/day05.cpp
index 92e39fc..42fda29 100644
--- a/src/day05.cpp
+++ b/src/day05.cpp
@@ -49,7 +49,7 @@ read_file(string_view filename)
 vector<string>
 split(const string& line, char sep)
 {
-        vector<string> parts{};
+        vector<string> parts;
         stringstream   input{ line };
 
         for ( string part; getline(input, part, sep); ) {
@@ -60,10 +60,8 @@ split(const string& line, char sep)
 }
 
 void
-part1()
+part1(const vector<string>& lines)
 {
-        auto lines = read_file("data/day05.txt");
-
         auto read_ints = [](const string& line) {
                 stringstream iss{ line };
                 return vector<long>{ istream_iterator<long>{ iss }, istream_iterator<long>{} };
@@ -71,8 +69,8 @@ part1()
 
         auto seeds = read_ints(lines[0].substr(6));
 
-        map<string, string>        category_mapping{};
-        map<string, vector<Entry>> range_mapping{};
+        map<string, string>        category_mapping;
+        map<string, vector<Entry>> range_mapping;
 
         // read blocks
         for ( size_t idx = 1; idx < lines.size(); ) {
@@ -84,7 +82,7 @@ part1()
 
                 category_mapping[parts[0]] = parts[2];
 
-                vector<Entry> mapping{};
+                vector<Entry> mapping;
 
                 for ( ; idx < lines.size() && !lines[idx].empty(); ++idx ) {
                         auto values = read_ints(lines[idx]);
@@ -117,10 +115,8 @@ part1()
 }
 
 void
-part2()
+part2(const vector<string>& lines)
 {
-        auto lines = read_file("data/day05-sample1.txt");
-
         auto read_ints = [](const string& line) {
                 stringstream iss{ line };
                 return vector<long>{ istream_iterator<long>{ iss }, istream_iterator<long>{} };
@@ -128,8 +124,8 @@ part2()
 
         auto seeds = read_ints(lines[0].substr(6));
 
-        map<string, string>        category_mapping{};
-        map<string, vector<Entry>> range_mapping{};
+        map<string, string>        category_mapping;
+        map<string, vector<Entry>> range_mapping;
 
         // read blocks
         for ( size_t idx = 1; idx < lines.size(); ) {
@@ -141,7 +137,7 @@ part2()
 
                 category_mapping[parts[0]] = parts[2];
 
-                vector<Entry> mapping{};
+                vector<Entry> mapping;
 
                 for ( ; idx < lines.size() && !lines[idx].empty(); ++idx ) {
                         auto values = read_ints(lines[idx]);
@@ -181,6 +177,7 @@ part2()
 int
 main()
 {
-        part1();
-        part2();
+        auto lines = read_file("data/day05.txt");
+        part1(lines);
+        part2(lines);
 }
diff --git a/src/day09.cpp b/src/day09.cpp
index 0019d05..4b30e6e 100644
--- a/src/day09.cpp
+++ b/src/day09.cpp
@@ -45,10 +45,8 @@ solve_rec(const vector<T>& values)
 }
 
 void
-part1()
+part1(const vector<string>& lines)
 {
-        auto lines = read_file("data/day09.txt");
-
         long sum = 0;
         for ( const auto& line: lines ) {
                 sum += solve_rec(read_ints(line));
@@ -57,10 +55,10 @@ part1()
 }
 
 void
-part2()
+part2(const vector<string>& lines)
 {
         long sum = 0;
-        for ( const auto& line: read_file("data/day09.txt") ) {
+        for ( const auto& line: lines ) {
                 auto values = read_ints(line);
                 reverse(values.begin(), values.end());
                 sum += solve_rec(values);
@@ -71,6 +69,7 @@ part2()
 int
 main()
 {
-        part1();
-        part2();
+        auto lines = read_file("data/day09.txt");
+        part1(lines);
+        part2(lines);
 }
diff --git a/src/day10.cpp b/src/day10.cpp
index 5591290..264e111 100644
--- a/src/day10.cpp
+++ b/src/day10.cpp
@@ -38,8 +38,7 @@ find_start_pos(const puzzle_t& puzzle)
 bool
 predict_direction(const puzzle_t& puzzle, pos_t& current, char& direction)
 {
-        auto x = get<0>(current); // NOLINT
-        auto y = get<1>(current); // NOLINT
+        auto [x, y] = current;
 
         if ( direction == 'S' ) {
                 ++y;
@@ -115,10 +114,8 @@ predict_direction(const puzzle_t& puzzle, pos_t& current, char& direction)
 };
 
 void
-part1()
+part1(const puzzle_t& puzzle)
 {
-        const auto puzzle = read_file("data/day10.txt");
-
         const auto start_pos = find_start_pos(puzzle);
 
         auto max_steps = 0;
@@ -163,10 +160,8 @@ flood_fill(puzzle_t& puzzle, size_t x, size_t y)
 };
 
 void
-part2()
+part2(const puzzle_t& puzzle_original)
 {
-        const auto puzzle_original = read_file("data/day10.txt");
-
         puzzle_t puzzle{ puzzle_original.size(), string(puzzle_original[0].size(), ' ') };
 
         const auto start_pos = find_start_pos(puzzle_original);
@@ -176,8 +171,7 @@ part2()
                 auto current_pos       = start_pos;
 
                 for ( ;; ) {
-                        auto x = get<0>(current_pos); // NOLINT
-                        auto y = get<1>(current_pos); // NOLINT
+                        auto [x, y] = current_pos;
 
                         puzzle[y][x] = puzzle_original[y][x];
 
@@ -216,6 +210,7 @@ part2()
 int
 main()
 {
-        part1();
-        part2();
+        const auto puzzle = read_file("data/day10.txt");
+        part1(puzzle);
+        part2(puzzle);
 }
diff --git a/src/day12.cpp b/src/day12.cpp
index 31a2739..b01b2fb 100644
--- a/src/day12.cpp
+++ b/src/day12.cpp
@@ -104,10 +104,8 @@ brute_force(string_view puzzle, const vector<long>& nums)
 }
 
 void
-part1()
+part1(const vector<string>& input)
 {
-        const auto input = read_file("data/day12.txt");
-
         auto sum = 0L;
         for ( const auto& line: input ) {
                 auto parts  = split(line, ' ');
@@ -122,5 +120,6 @@ part1()
 int
 main()
 {
-        part1();
+        const auto input = read_file("data/day12.txt");
+        part1(input);
 }
diff --git a/src/day14.cpp b/src/day14.cpp
index 2b7a5b8..8816ce1 100644
--- a/src/day14.cpp
+++ b/src/day14.cpp
@@ -21,10 +21,8 @@ read_file(string_view filename)
 }
 
 void
-part1()
+part1(const vector<string>& lines)
 {
-        const auto lines = read_file("data/day14.txt");
-
         auto start = chrono::steady_clock::now();
 
         size_t sum = 0;
@@ -182,10 +180,9 @@ tilt_east(vector<string>& lines)
 void
 tilt(vector<string>& lines)
 {
-        tilt_north(lines);
-        tilt_west(lines);
-        tilt_south(lines);
-        tilt_east(lines);
+        for ( auto tilt: { tilt_north, tilt_west, tilt_south, tilt_east } ) {
+                tilt(lines);
+        }
 }
 
 size_t
@@ -201,16 +198,14 @@ calc(const vector<string>& lines)
 }
 
 void
-part2()
+part2(vector<string> lines)
 {
-        auto lines = read_file("data/day14.txt");
-
         auto                      start = chrono::steady_clock::now();
         map<vector<string>, long> cache;
 
         const long dest = 1'000'000'000;
 
-        for ( long index = 0; true; ++index ) {
+        for ( long index = 0;; ++index ) {
                 auto iter = cache.find(lines);
                 if ( iter != cache.end() ) {
                         auto offset       = iter->second;
@@ -238,6 +233,7 @@ part2()
 int
 main()
 {
-        part1();
-        part2();
+        const auto lines = read_file("data/day14.txt");
+        part1(lines);
+        part2(lines);
 }
diff --git a/src/day16.cpp b/src/day16.cpp
index c2cd365..93c7479 100644
--- a/src/day16.cpp
+++ b/src/day16.cpp
@@ -44,9 +44,7 @@ solve(const vector<string>& lines, tuple<size_t, size_t, unsigned int> start)
         positions.emplace(start);
 
         while ( !positions.empty() ) {
-                auto row = get<0>(positions.front());
-                auto col = get<1>(positions.front());
-                auto dir = get<2>(positions.front());
+                auto [row, col, dir] = positions.front();
                 positions.pop();
 
                 while ( true ) {