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I give up

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mnerv
2025-12-09 07:53:44 +01:00
parent 14ec3ca2da
commit 6a68cbfb93
1 changed files with 21 additions and 36 deletions
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57
2025/day01.cpp
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@@ -56,59 +56,44 @@ R14
L82 L82
)"; )";
enum class rotdir { auto map_char_to_rotdir(char c) -> i32 {
none,
L,
R
};
struct rot {
rotdir dir;
u32 turns;
};
auto map_char_to_rotdir(char c) -> rotdir {
switch (c) { switch (c) {
using enum rotdir; case 'L': return -1;
case 'L': return L; case 'R':
case 'R': return R; default: return 1;
default: return none;
}
}
auto map_dir_to_i32(i32 value, rotdir dir) -> i32 {
switch (dir) {
using enum rotdir;
case L: return -value;
case R:
default: return value;
} }
} }
static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void { static auto entry([[maybe_unused]]std::span<char const*> const& args) -> void {
// std::string str{raw_str}; // std::string str{raw_str};
// str = str | trim; auto str = aoc::read_text("./input.txt").value_or("");
auto str = aoc::read_text("./input.txt").value_or("") | trim; str = str | trim;
auto rot_vec = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) { auto rot_vec = str | std::views::split("\n"sv) | std::views::transform([](auto const& str) {
return rot{ return i32(std::stoi(std::string{++std::begin(str), std::end(str)})) * map_char_to_rotdir(*std::begin(str));
.dir = map_char_to_rotdir(*std::begin(str)),
.turns = u32(std::stoul(std::string{++std::begin(str), std::end(str)}))
};
}) | std::ranges::to<std::vector>(); }) | std::ranges::to<std::vector>();
i32 start = 50; i32 start = 50;
auto sum = std::ranges::fold_left(rot_vec, 0, [&start](auto a, auto b) { i32 zero_cross = 0;
auto c = map_dir_to_i32(b.turns % 100, b.dir); auto sum = std::ranges::fold_left(rot_vec, 0, [&](auto a, auto t) {
auto const p = start;
auto const all_d = (100 + p - t);
start = all_d % 100;
start = (100 + start + c) % 100; auto const z = (all_d - 99 - start) / 100;
if (start == 0) ++a; fmt::print("pos: {}, next: {}, {}, {} z: {}\n", p, start, t, all_d, z);
zero_cross += z;
if (start == 0) {
a += 1 + zero_cross;
zero_cross = 0;
}
return a; return a;
}); });
fmt::print("res: {}\n", sum); fmt::print("res: {}, {}\n", sum, zero_cross);
} }
auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int { auto main([[maybe_unused]]int argc, [[maybe_unused]]char const* argv[]) -> int {