91 lines
1.6 KiB
C++
91 lines
1.6 KiB
C++
#include <BAN/Vector.h>
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#include <BAN/String.h>
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#include <BAN/StringView.h>
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#include <stdio.h>
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#include <string.h>
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static int matching_numbers(BAN::StringView line)
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{
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ASSERT(line.size() == 117);
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line = line.substring(0, line.size() - 1);
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auto winning_numbers = MUST(line.substring(10, 29).split(' '));
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auto your_numbers = MUST(line.substring(42).split(' '));
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int matching = 0;
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for (auto number : your_numbers)
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if (winning_numbers.contains(number))
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matching++;
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return matching;
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}
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int puzzle1(FILE* fp)
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{
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int result = 0;
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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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if (strncmp(buffer, "Card", 4))
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continue;
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int matching = matching_numbers(buffer);
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if (matching > 0)
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result += 1 << (matching - 1);
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}
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return result;
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}
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int puzzle2(FILE* fp)
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{
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struct Card
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{
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BAN::String line;
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int count;
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};
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BAN::Vector<Card> cards;
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char buffer[128];
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while (fgets(buffer, sizeof(buffer), fp))
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if (strncmp(buffer, "Card", 4) == 0)
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MUST(cards.emplace_back(BAN::StringView(buffer), 1));
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int result = 0;
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for (size_t i = 0; i < cards.size(); i++)
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{
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int matching = matching_numbers(cards[i].line);
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for (int j = 0; j < matching; j++)
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cards[i + j + 1].count += cards[i].count;
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result += cards[i].count;
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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/day4_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: %d\n", puzzle1(fp));
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fseek(fp, 0, SEEK_SET);
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printf("puzzle2: %d\n", puzzle2(fp));
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fclose(fp);
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}
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