forked from Bananymous/banan-os
291 lines
6.5 KiB
C++
291 lines
6.5 KiB
C++
#include <BAN/Array.h>
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#include <BAN/HashMap.h>
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#include <BAN/HashSet.h>
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#include <BAN/Sort.h>
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#include <BAN/String.h>
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#include <BAN/Vector.h>
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#include <sys/time.h>
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#include <ctype.h>
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#include <inttypes.h>
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#include <stdio.h>
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using i8 = int8_t;
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using i16 = int16_t;
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using i32 = int32_t;
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using i64 = int64_t;
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using u8 = uint8_t;
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using u16 = uint16_t;
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using u32 = uint32_t;
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using u64 = uint64_t;
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enum Variable { x, m, a, s };
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enum class Comparison { Less, Greater, Always };
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struct Rule
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{
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Variable operand1;
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i64 operand2;
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Comparison comparison;
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BAN::String target;
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};
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using Workflows = BAN::HashMap<BAN::String, BAN::Vector<Rule>>;
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struct Item
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{
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i64 values[4];
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bool operator==(const Item& other) const
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{
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return memcmp(values, other.values, sizeof(values)) == 0;
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}
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};
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struct ItemHash
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{
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BAN::hash_t operator()(const Item& item) const
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{
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return BAN::hash<u64>()(item.values[0]) ^
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BAN::hash<u64>()(item.values[1]) ^
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BAN::hash<u64>()(item.values[2]) ^
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BAN::hash<u64>()(item.values[3]);
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};
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};
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i64 parse_i64(BAN::StringView str)
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{
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i64 result = 0;
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for (size_t i = 0; i < str.size() && isdigit(str[i]); i++)
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result = (result * 10) + (str[i] - '0');
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return result;
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}
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bool get_line(FILE* fp, BAN::String& out)
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{
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out.clear();
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bool success = false;
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char buffer[128];
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while (fgets(buffer, sizeof(buffer), fp))
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{
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success = true;
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MUST(out.append(buffer));
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if (out.back() == '\n')
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{
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out.pop_back();
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break;
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}
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}
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return success;
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}
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Workflows parse_workflows(FILE* fp)
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{
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Workflows workflows;
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BAN::String line;
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while (get_line(fp, line) && !line.empty())
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{
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auto name = line.sv().substring(0, *line.sv().find('{'));
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MUST(workflows.emplace(name));
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auto rule_str = line.sv().substring(*line.sv().find('{') + 1);
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rule_str = rule_str.substring(0, rule_str.size() - 1);
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auto rules_str = MUST(rule_str.split(','));
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for (size_t i = 0; i < rules_str.size() - 1; i++)
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{
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Rule rule;
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rule.operand1 = (rules_str[i][0] == 'x') ? Variable::x :
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(rules_str[i][0] == 'm') ? Variable::m :
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(rules_str[i][0] == 'a') ? Variable::a :
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Variable::s;
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rule.operand2 = parse_i64(rules_str[i].substring(2));
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rule.comparison = (rules_str[i][1] == '<') ? Comparison::Less : Comparison::Greater;
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rule.target = rules_str[i].substring(*rules_str[i].find(':') + 1);
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MUST(workflows[name].push_back(BAN::move(rule)));
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}
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MUST(workflows[name].emplace_back(Variable::x, 0, Comparison::Always, rules_str.back()));
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}
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return workflows;
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}
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BAN::Vector<Item> parse_items(FILE* fp)
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{
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BAN::Vector<Item> items;
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BAN::String line;
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while (get_line(fp, line) && !line.empty())
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{
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auto values = MUST(line.sv().substring(1, line.size() - 2).split(','));
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ASSERT(values.size() == 4);
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ASSERT(values[0][0] == 'x');
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ASSERT(values[1][0] == 'm');
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ASSERT(values[2][0] == 'a');
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ASSERT(values[3][0] == 's');
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Item item;
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item.values[0] = parse_i64(values[0].substring(2));
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item.values[1] = parse_i64(values[1].substring(2));
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item.values[2] = parse_i64(values[2].substring(2));
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item.values[3] = parse_i64(values[3].substring(2));
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MUST(items.push_back(item));
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}
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return items;
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}
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bool satifies_rule(const Item& item, const Rule& rule)
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{
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switch (rule.comparison)
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{
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case Comparison::Always:
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return true;
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case Comparison::Less:
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return item.values[rule.operand1] < rule.operand2;
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case Comparison::Greater:
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return item.values[rule.operand1] > rule.operand2;
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}
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ASSERT_NOT_REACHED();
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}
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bool is_accepted(const Item& item, const BAN::String& name, const Workflows& workflows)
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{
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const auto& workflow = workflows[name];
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for (const auto& rule : workflow)
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{
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if (!satifies_rule(item, rule))
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continue;
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if (rule.target == "A"_sv)
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return true;
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if (rule.target == "R"_sv)
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return false;
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return is_accepted(item, rule.target, workflows);
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}
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ASSERT_NOT_REACHED();
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}
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i64 puzzle1(FILE* fp)
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{
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auto workflows = parse_workflows(fp);
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auto items = parse_items(fp);
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BAN::Vector<Item> accepted;
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for (const auto& item : items)
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if (is_accepted(item, "in"_sv, workflows))
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MUST(accepted.push_back(item));
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i64 result = 0;
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for (const auto& item : accepted)
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result += item.values[0] + item.values[1] + item.values[2] + item.values[3];
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return result;
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}
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i64 puzzle2(FILE* fp)
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{
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auto workflows = parse_workflows(fp);
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BAN::Array<BAN::HashSet<i64>, 4> values;
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for (const auto& workflow : workflows)
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{
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for (const auto& rule : workflow.value)
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{
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if (rule.comparison != Comparison::Always)
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{
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MUST(values[rule.operand1].insert(rule.operand2));
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MUST(values[rule.operand1].insert(rule.operand2 + 1));
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}
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}
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}
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for (i64 i = 0; i < 4; i++)
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{
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MUST(values[i].insert(1));
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MUST(values[i].insert(4001));
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}
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BAN::Array<BAN::Vector<i64>, 4> values_sorted;
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for (i64 i = 0; i < 4; i++)
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{
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MUST(values_sorted[i].reserve(values[i].size()));
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for (i64 value : values[i])
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MUST(values_sorted[i].push_back(value));
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BAN::sort::sort(values_sorted[i].begin(), values_sorted[i].end());
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}
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i64 result = 0;
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for (u64 xi = 0; xi < values_sorted[0].size() - 1; xi++)
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{
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timespec time_start;
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clock_gettime(CLOCK_MONOTONIC, &time_start);
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for (u64 mi = 0; mi < values_sorted[1].size() - 1; mi++)
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{
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for (u64 ai = 0; ai < values_sorted[2].size() - 1; ai++)
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{
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for (u64 si = 0; si < values_sorted[3].size() - 1; si++)
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{
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Item item {{
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values_sorted[0][xi],
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values_sorted[1][mi],
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values_sorted[2][ai],
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values_sorted[3][si]
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}};
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if (!is_accepted(item, "in"_sv, workflows))
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continue;
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i64 x_count = values_sorted[0][xi + 1] - values_sorted[0][xi];
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i64 m_count = values_sorted[1][mi + 1] - values_sorted[1][mi];
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i64 a_count = values_sorted[2][ai + 1] - values_sorted[2][ai];
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i64 s_count = values_sorted[3][si + 1] - values_sorted[3][si];
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result += x_count * m_count * a_count * s_count;
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}
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}
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}
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timespec time_stop;
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clock_gettime(CLOCK_MONOTONIC, &time_stop);
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u64 duration_us = (time_stop.tv_sec * 1'000'000 + time_stop.tv_nsec / 1'000) - (time_start.tv_sec * 1'000'000 + time_start.tv_nsec / 1'000);
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printf("step took %" PRIu64 ".%03" PRIu64 " ms, estimate %" PRIu64 " s\n", duration_us / 1000, duration_us % 1000, (values_sorted[0].size() - xi - 2) * duration_us / 1'000'000);
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}
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return result;
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}
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int main(int argc, char** argv)
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{
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const char* file_path = "/usr/share/aoc2023/day19_input.txt";
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if (argc >= 2)
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file_path = argv[1];
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FILE* fp = fopen(file_path, "r");
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if (fp == nullptr)
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{
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perror("fopen");
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return 1;
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}
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printf("puzzle1: %" PRId64 "\n", puzzle1(fp));
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fseek(fp, 0, SEEK_SET);
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printf("puzzle2: %" PRId64 "\n", puzzle2(fp));
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fclose(fp);
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}
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