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This commit is contained in:
Eric Mertens 2024-12-29 15:13:26 -06:00
parent 44d79ff3ef
commit d3a6fda730
1 changed files with 29 additions and 20 deletions
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37
2024/19.cpp
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@ -6,8 +6,8 @@
#include <cstdint>
#include <iostream>
#include <string_view>
#include <string>
#include <string_view>
#include <tuple>
#include <vector>
@ -16,23 +16,28 @@ namespace qi = boost::spirit::qi;
using std::istream;
using std::ostream;
using std::size_t;
using std::string_view;
using std::string;
using std::string_view;
using std::tuple;
using std::uint64_t;
using std::vector;
namespace {
auto ways(vector<string> const& towels, string const& design) -> uint64_t
namespace
{
vector<uint64_t> counts(design.size() + 1);
auto ways(const vector<string> &towels, const string &design) -> uint64_t
{
const auto n = design.size();
vector<uint64_t> counts(n + 1);
counts[0] = 1;
for (size_t i = 0; i < design.size(); i++) {
auto const suffix = string_view{ begin(design) + i, end(design) };
for (auto && towel : towels) {
if (suffix.starts_with(towel)) {
for (size_t i = 0; i < n; i++)
{
string_view const suffix{begin(design) + i, end(design)};
for (auto &&towel : towels)
{
if (suffix.starts_with(towel))
{
counts[i + towel.size()] += counts[i];
}
}
@ -45,15 +50,19 @@ auto ways(vector<string> const& towels, string const& design) -> uint64_t
auto Main(istream &in, ostream &out) -> void
{
auto const [towels, designs] =
const auto [towels, designs] =
aocpp::ParseSimple
<tuple<vector<string>, vector<string>>>
(in, +qi::alpha % ", " >> "\n\n" >> *(+qi::alpha >> "\n"));
uint64_t p1 = 0, p2 = 0;
for (auto && d : designs) {
auto const n = ways(towels, d);
if (n > 0) { p1++; }
for (auto &&design : designs)
{
const auto n = ways(towels, design);
if (n > 0)
{
p1++;
}
p2 += n;
}