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This commit is contained in:
Eric Mertens 2023-01-24 12:01:42 -05:00
parent f5f1680de3
commit 277b24e9f4
3 changed files with 41 additions and 37 deletions
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8
2022/06.cpp
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@ -18,15 +18,11 @@ auto Solve(std::string const& input, std::size_t n) -> std::size_t
std::size_t uniques {0};
auto const inc = [&](char c) {
if (0 == counts[static_cast<std::uint8_t>(c)]++) {
uniques++;
}
uniques += 1 == ++counts[static_cast<std::uint8_t>(c)];
};
auto const dec = [&](char c) {
if (0 == --counts[static_cast<std::uint8_t>(c)]) {
uniques--;
}
uniques -= 0 == --counts[static_cast<std::uint8_t>(c)];
};
for (std::size_t i = 0; i < n; ++i) {

64
2022/09.cpp
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@ -15,9 +15,9 @@ using namespace aocpp;
namespace {
using Dir = Coord(*)(Coord);
using DirFn = Coord(Coord);
auto ToDir(char c) -> Dir {
auto ToDir(char c) -> DirFn* {
switch (c) {
case 'L': return Left;
case 'R': return Right;
@ -35,38 +35,48 @@ auto Sign(std::int64_t x) -> std::int64_t
return (x>0) - (x<0);
}
auto Solve(std::istream & in) -> std::pair<std::int64_t, std::int64_t>
{
std::size_t constexpr knotn {10};
Coord knots[knotn] {};
std::set<Coord> p1{knots[1]}, p2{knots[9]};
char d;
long n;
class Logic {
Coord knots[10] {}; // Current location of each knot in the rope
std::set<Coord> s1{{}}, s9{{}};
while (in >> d >> n) {
auto const dir = ToDir(d);
while (n--) {
knots[0] = dir(knots[0]);
std::size_t k;
for (k = 1; k < knotn; ++k) {
auto const delta {knots[k-1] - knots[k]};
if (NormInf(delta) <= 1) {
break;
}
knots[k] += {Sign(delta.x), Sign(delta.y)};
public:
auto answer() const -> std::pair<std::size_t, std::size_t>
{
return {s1.size(), s9.size()};
}
auto move(DirFn* dirFn) -> void
{
knots[0] = dirFn(knots[0]);
std::size_t k;
for (k = 1; k < 10; ++k) {
auto const delta {knots[k-1] - knots[k]};
if (NormInf(delta) <= 1) {
break;
}
knots[k] += {Sign(delta.x), Sign(delta.y)};
}
if (k > 1) {
p1.insert(knots[1]);
if (k > 9) {
p2.insert(knots[9]);
}
// only update the sets when a knot actually moved
if (k > 1) {
s1.insert(knots[1]);
if (k > 9) {
s9.insert(knots[9]);
}
}
}
};
return {p1.size(), p2.size()};
auto Solve(std::istream & in) -> std::pair<std::size_t, std::size_t>
{
Logic logic;
char d;
std::size_t n;
while (in >> d >> n) {
while (n--) { logic.move(ToDir(d)); }
}
return logic.answer();
}
} // namespace

6
2022/20.cpp
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@ -33,10 +33,8 @@ auto Solve(Input const& input, std::size_t const rounds) -> std::int64_t
std::size_t const len = input.size();
std::vector<std::size_t> fwds(len), bwds(len);
for (std::size_t i = 0; i < len; ++i) {
fwds[i] = aocpp::Mod<std::int64_t>(i+1, len);
bwds[i] = aocpp::Mod<std::int64_t>(i-1, len);
}
std::iota(fwds.begin(), fwds.end()-1, 1); fwds.back() = 0;
std::iota(bwds.begin()+1, bwds.end(), 0); bwds.front() = len-1;
for (std::size_t r = 0; r < rounds; ++r) {
for (std::size_t i = 0; i < len; ++i) {