github: added token

.github/workflows/cmake-single-platform.yml

@@ -22,6 +22,7 @@ jobs:
     steps:
     - uses: actions/checkout@v4
       with:
+        token: ${{ secrets.DATA_PAT }}
         submodules: recursive
 
     - name: Configure CMake

CMakeLists.txt

@@ -1,6 +1,8 @@
 cmake_minimum_required(VERSION 3.20)
 project(advent2024 LANGUAGES CXX)
 
+option(DAY7_CONSTEXPR "Enables computing solution at compile-time" OFF)
+
 set(CMAKE_EXPORT_COMPILE_COMMANDS ON)
 add_compile_options(-Wall -Wextra -Wpedantic -O2)
 
@@ -20,6 +22,9 @@ add_challenge(day5)
 ### Day 7
 add_challenge(day7)
 target_compile_options(day7 PRIVATE -fconstexpr-ops-limit=3355443200)
+if(DAY7_CONSTEXPR)
+    target_compile_options(day7 PRIVATE -DDAY7_CONSTEXPR)
+endif()
 
 # Read the content of the input file
 file(READ ${CMAKE_CURRENT_SOURCE_DIR}/data/2024/day7.txt FILE_CONTENT)
@@ -32,16 +37,16 @@ file(WRITE ${CMAKE_CURRENT_SOURCE_DIR}/data/2024/day7_constexpr.txt ${FILE_CONTE
 
 
 add_challenge(day8)
-add_challenge(day9)
+# add_challenge(day9)
 add_challenge(day10)
 add_challenge(day11)
 add_challenge(day12)
 add_challenge(day13)
 add_challenge(day14)
-add_challenge(day15)
-add_challenge(day16)
-add_challenge(day17)
-add_challenge(day18)
+# add_challenge(day15)
+# add_challenge(day16)
+# add_challenge(day17)
+# add_challenge(day18)
 add_challenge(day19)
 add_challenge(day24)
 add_challenge(day25)

include/common_headers.hpp

@@ -2,10 +2,13 @@
 #include "utils/input_parser.hpp"
 
 #include <algorithm>
+#include <array>
+#include <cstdint>
 #include <iostream>
 #include <fstream>
 #include <charconv>
 #include <vector>
+#include <string>
 #include <stdexcept>
 #include <numeric>
 #include <unordered_map>

include/utils/numeric_algorithm.hpp

@@ -1,6 +1,6 @@
 #pragma once
 
-#include <stdint.h>
+#include <cstdint>
 #include <cmath>
 
 [[nodiscard]] constexpr size_t numOfDigits(uint64_t num) noexcept {

src/day1.cpp

@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <cstdint>
 #include <iostream>
 #include <fstream>
 #include <vector>

src/day11.cpp

@@ -2,6 +2,7 @@
 #include "utils/numeric_algorithm.hpp"
 
 #include <cmath>
+#include <cstdint>
 #include <sstream>
 
 

src/day13.cpp

@@ -0,0 +1,192 @@
+#include "common_headers.hpp"
+#include <cmath>
+#include <regex>
+
+void printHelp()
+{
+    std::cerr << "\nUsage:\n"
+    << "The program requires 2 args: (part1, part2) and the path to the file."
+    << "\nFor example, ./day7 part1 data/day7.txt";
+}
+
+using Matrix = std::vector<std::vector<long double>>;
+using Vector = std::vector<long double>;
+
+struct EquationParams final
+{
+    Matrix coords;
+    Vector result;
+
+    void appendXY(std::pair<int64_t, int64_t> xy) {
+        coords.resize(2);
+        coords[0].push_back(xy.first);
+        coords[1].push_back(xy.second);
+    }
+
+    void setResult(std::pair<int64_t, int64_t> resultXY) {
+        result.push_back(resultXY.first);
+        result.push_back(resultXY.second);
+    }
+};
+
+
+void gaussianElimination(Matrix& A, Vector& b) {
+    int n = A.size();
+
+    for (int i = 0; i < n; ++i) {
+        // Partial pivoting
+        int maxRow = i;
+        for (int k = i + 1; k < n; ++k) {
+            if (std::abs(A[k][i]) > std::abs(A[maxRow][i])) {
+                maxRow = k;
+            }
+        }
+
+        // Swap rows in A and b
+        std::swap(A[i], A[maxRow]);
+        std::swap(b[i], b[maxRow]);
+
+        // Check for singularity
+        if (std::abs(A[i][i]) < 1e-10) {
+            throw std::runtime_error("Matrix is singular or nearly singular");
+        }
+
+        // Eliminate column i below the pivot
+        for (int k = i + 1; k < n; ++k) {
+            double factor = A[k][i] / A[i][i];
+            for (int j = i; j < n; ++j) {
+                A[k][j] -= factor * A[i][j];
+            }
+            b[k] -= factor * b[i];
+        }
+    }
+}
+
+Vector backSubstitution(const Matrix& A, const Vector& b) {
+    int n = A.size();
+    Vector x(n);
+
+    for (int i = n - 1; i >= 0; --i) {
+        x[i] = b[i];
+        for (int j = i + 1; j < n; ++j) {
+            x[i] -= A[i][j] * x[j];
+        }
+        x[i] /= A[i][i];
+    }
+
+    return x;
+}
+
+Vector solveLinearSystem(Matrix A, Vector b) {
+    gaussianElimination(A, b);
+    return backSubstitution(A, b);
+}
+
+bool checkResultCorrectness(const Vector& result, double upperBoundValue) {
+    for(auto r : result) {
+        if(!std::isfinite(r) || std::abs(std::trunc(std::round(r)) - r) > 0.0003 || r > upperBoundValue) {
+            if(r > 100) {
+            }
+            std::cerr << "\nsolution incorrect: " << r ;
+            return false;
+        }
+    }
+    return true;
+}
+
+size_t solveFirstPart(const std::vector<EquationParams>& equationParams) {
+    constexpr size_t costButtonA{3};
+    constexpr size_t costButtonB{1};
+    size_t tokens{};
+
+    for(const auto& equation : equationParams) {
+        Vector result = solveLinearSystem(equation.coords, equation.result);
+        if(checkResultCorrectness(result, 100)) {
+            tokens += static_cast<size_t>(std::round(result.at(0))) * costButtonA + static_cast<size_t>(std::round(result.at(1)) * costButtonB);
+        }
+    }
+    return tokens;
+}
+
+size_t solveSecondPart(const std::vector<EquationParams>& equationParams) {
+    constexpr size_t costButtonA{3};
+    constexpr size_t costButtonB{1};
+    size_t tokens{};
+
+    for(const auto& equation : equationParams) {
+        Vector result = solveLinearSystem(equation.coords, equation.result);
+        if(checkResultCorrectness(result, 10000000000000)) {
+            tokens += static_cast<size_t>(std::round(result.at(0))) * costButtonA + static_cast<size_t>(std::round(result.at(1)) * costButtonB);
+        }
+    }
+    return tokens;
+}
+
+
+[[nodiscard]] std::pair<int64_t, int64_t> parseXY(const std::string& input) {
+    std::pair<int64_t, int64_t> values{};
+
+    // Regular expression to match the input pattern
+    std::regex pattern(R"((\w+ \w+|\w+): X[+=](\-?\d+), Y[+=](\-?\d+))");
+    std::smatch matches;
+
+    std::string::const_iterator searchStart(input.cbegin());
+    std::regex_search(searchStart, input.cend(), matches, pattern);
+    // std::cerr << "\nx " << matches[2] << " y " << matches[3];
+    return std::pair{std::stoll(matches[2]), std::stoll(matches[3])};
+}
+
+[[nodiscard]] EquationParams parse(const std::string& buttonA, const std::string& buttonB, const std::string& result) {
+    EquationParams params;
+    params.appendXY(parseXY(buttonA));
+    params.appendXY(parseXY(buttonB));
+    params.setResult(parseXY(result));
+    return params;
+}
+
+[[nodiscard]] std::vector<EquationParams> parseEquationParams(const std::vector<std::string>& inputLines) {
+    std::vector<EquationParams> equationParams;
+    for(size_t i = 0; i + 3 <= inputLines.size();) {
+        if(inputLines[i].empty()) {
+            ++i;
+        }
+        else {
+            equationParams.emplace_back(parse(inputLines[i], inputLines[i + 1], inputLines[i + 2]));
+            i += 3;
+        }
+    }
+    return equationParams;
+}
+
+int main(int argc, char* argv[])
+{
+    if(argc != 3) {
+        printHelp();
+        return 1;
+    }
+
+    std::string_view task{argv[1]};
+    if(task != "part1" && task != "part2") {
+        std::cerr << "\nfirst arg can be either `part1` or `part2`\n";
+        printHelp();
+        return 1;
+    }
+
+    std::vector<std::string> inputVec;
+    readInput(argv[2], std::back_inserter(inputVec));
+    std::vector<EquationParams> equationParams = parseEquationParams(inputVec);
+
+
+    if(task == "part1") {
+        std::cout << solveFirstPart(equationParams);
+    }
+    else {
+        for(auto& param : equationParams) {
+            param.result[0] += 10000000000000;
+            param.result[1] += 10000000000000;
+        }
+        std::cout << solveSecondPart(equationParams);
+    }
+
+    return 0;
+}

src/day1_part2.cpp

@@ -1,4 +1,5 @@
 #include <algorithm>
+#include <cstdint>
 #include <iostream>
 #include <fstream>
 #include <unordered_map>

src/day2_part1.cpp

@@ -0,0 +1,83 @@
+#include <algorithm>
+#include <iostream>
+#include <fstream>
+#include <charconv>
+#include <vector>
+#include <stdexcept>
+
+namespace {
+void parseLevels(const std::string& report, std::vector<int>& out)
+{
+    if(report.empty()) return;
+
+    const char *begin = &report[0];
+    const char * const end = &report[report.size()];
+    std::from_chars_result result{};
+    int val{};
+    while(begin != end) {
+        result = std::from_chars(begin, end, val);
+        if(result.ec != std::errc()) {
+            std::cerr << "\nreport: " << report;
+            throw std::logic_error{"Invalid report input string"};
+        }
+        begin = std::min(result.ptr + 1, end);
+        out.push_back(val);
+    }
+}
+
+[[nodiscard]] constexpr bool isLevelsSafe(int largelLevel, int smallerLevel) noexcept
+{
+    const auto diff{largelLevel - smallerLevel};
+    return 1 <= diff && diff <= 3;
+}
+
+
+[[nodiscard]] bool isAscendingSafe(const std::vector<int>& levels) noexcept
+{
+    return std::adjacent_find(levels.begin(), levels.end(), [](int smallerLevel, int largerLevel) {
+        return !isLevelsSafe(largerLevel, smallerLevel);
+    }) == levels.end();
+}
+
+[[nodiscard]] bool isDescendingSafe(const std::vector<int>& levels) noexcept
+{
+    return std::adjacent_find(levels.rbegin(), levels.rend(), [](int smallerLevel, int largerLevel) {
+        return !isLevelsSafe(largerLevel, smallerLevel);
+    }) == levels.rend();
+}
+
+[[nodiscard]] bool isSafe(const std::vector<int>& levels) noexcept
+{
+    if(levels.front() < levels.back()) {
+        return isAscendingSafe(levels);
+    }
+    return isDescendingSafe(levels);
+}
+} //< anonymous namespace
+
+int main(int argc, char *argv[]) {
+    if(argc != 2) {
+        std::cerr << "\nUsage:\n"
+        << "The program requires the path to the file.";
+        return 1;
+    }
+
+    std::ifstream ifile(argv[1]);
+    if(!ifile) {
+        std::cerr << "\nFile cannot be open";
+        return 1;
+    }
+
+    size_t count{};
+    std::string report;
+    std::vector<int> levels;
+    while(std::getline(ifile, report)) {
+        // std::cerr << "\nline  " << report;
+        levels.clear();
+        parseLevels(report, levels);
+        count += isSafe(levels);
+    }
+    std::cout << count;
+
+    return 0;
+}

src/day4.cpp

@@ -1,5 +1,8 @@
 #include "common_headers.hpp"
 
+#include <array>
+
+
 /*
 Part 1.
 The task is to count the word `XMAS` horizontally, vertically, diagonally.