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d4p2

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This commit is contained in:
Feiko Wielsma 2025-12-04 15:36:34 +00:00
parent eac8571ea7
commit 0b2afd5993
1 changed files with 63 additions and 16 deletions
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79
day4/main.cpp
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@ -20,10 +20,10 @@ struct Diagram {
size_t width;
size_t height;
auto mdspan() const { return std::mdspan(data.data(), height, width); }
auto mdspan() { return std::mdspan(data.data(), height, width); }
};
auto printMap(const Diagram &diagram) {
auto printMap(Diagram &diagram) {
auto mdspan = diagram.mdspan();
for (auto row = 0UZ; row != mdspan.extent(0); row++) {
for (auto col = 0UZ; col != mdspan.extent(1); col++) {
@ -48,8 +48,7 @@ auto parseMap(const std::string &filename) -> std::expected<Diagram, std::string
while (std::getline(inputF, puzzleLine)) {
// std::println("{:3}: {}", diagram.height, puzzleLine);
diagram.data.push_back(0);
diagram.data.append_range(puzzleLine | std::views::transform([](char c) -> int { return c == '.' ? 0 : 1; }) |
std::ranges::to<std::vector<int>>());
diagram.data.append_range(puzzleLine | std::views::transform([](char c) -> int { return c == '.' ? 0 : 1; }));
diagram.data.push_back(0);
diagram.height++;
@ -62,12 +61,12 @@ auto parseMap(const std::string &filename) -> std::expected<Diagram, std::string
diagram.data.insert_range(diagram.data.begin(), std::vector<int>(diagram.width, 0));
diagram.height += 2;
printMap(diagram);
// auto ms2 = std::mdspan(diagram.data.data(), diagram.width, diagram.height);
// printMap(diagram);
// auto ms2 = std::mdspan(diagram.data.data(), diagram.width, diagram.height);
return std::move(diagram);
}
auto countMovablePaper(const Diagram &diagram) -> long {
auto countMovablePaper(Diagram &diagram) -> long {
long nMovablePaper{};
auto mdspan = diagram.mdspan();
for (auto row = 1UZ; row != mdspan.extent(0) - 1; row++) {
@ -75,7 +74,7 @@ auto countMovablePaper(const Diagram &diagram) -> long {
if (mdspan[row, col] == 1) {
// std::print("checking [{},{}]:", row, col);
// shitty kernal
// shitty kernel
int upLeft = mdspan[row - 1, col - 1];
int up = mdspan[row - 1, col];
int upRight = mdspan[row - 1, col + 1];
@ -100,26 +99,74 @@ auto countMovablePaper(const Diagram &diagram) -> long {
return nMovablePaper;
}
auto moveMoveablePaper(Diagram &diagram) -> long {
long totalPaperRemoved{};
auto mdspan = diagram.mdspan();
while (true) {
long currentPaperRemoved = 0;
for (auto row = 1UZ; row != mdspan.extent(0) - 1; row++) {
for (auto col = 1UZ; col != mdspan.extent(1) - 1; col++) {
if (mdspan[row, col] == 1) {
// std::print("checking [{},{}]:", row, col);
// shitty kernal
int neighbors{};
neighbors += mdspan[row - 1, col - 1];
neighbors += mdspan[row - 1, col];
neighbors += mdspan[row - 1, col + 1];
neighbors += mdspan[row, col - 1];
neighbors += mdspan[row, col + 1];
neighbors += mdspan[row + 1, col - 1];
neighbors += mdspan[row + 1, col];
neighbors += mdspan[row + 1, col + 1];
// caveman shit
if (neighbors < 4) {
mdspan[row, col] = 0;
// std::println("Found");
currentPaperRemoved++;
}
}
// std::println();
}
}
if (currentPaperRemoved == 0) {
std::println("Didn't remove any more paper this iteration! Stopping.");
break;
}
totalPaperRemoved += currentPaperRemoved;
// printMap(diagram);
}
return totalPaperRemoved;
}
auto main() -> int {
auto testCase = parseMap("test_input");
if (testCase) {
auto testResult = countMovablePaper(*testCase);
std::println("P1 Testcase result: {}", testResult);
// auto testResult = countMovablePaper(*testCase);
// std::println("P1 Testcase result: {}", testResult);
// auto testResultP2 = countMovablePaper(*testCase);
// std::println("P2 Testcase result: {}", testResultP2);
auto testResultP2 = moveMoveablePaper(*testCase);
std::println("P2 Testcase result: {}", testResultP2);
} else {
std::print("{}\n", testCase.error());
}
auto realPuzzle = parseMap("puzzle_input");
if (realPuzzle) {
auto realResult = countMovablePaper(*realPuzzle);
std::println("P1 Real result: {}", realResult);
// auto realResult = countMovablePaper(*realPuzzle);
// std::println("P1 Real result: {}", realResult);
// auto realResultP2 = countJoltagesP2(*realPuzzle);
// std::println("P2 Real result: {}", realResultP2);
auto realResultP2 = moveMoveablePaper(*realPuzzle);
std::println("P2 Real result: {}", realResultP2);
} else {
std::print("{}\n", realPuzzle.error());
}