forked from Bananymous/banan-os
110 lines
2.0 KiB
C++
110 lines
2.0 KiB
C++
#include <BAN/Array.h>
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#include <BAN/Vector.h>
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#include <BAN/StringView.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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i64 part1(FILE* fp)
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{
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bool requirements[100][100] {};
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char buffer[128];
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int a, b;
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while (fgets(buffer, sizeof(buffer), fp) && sscanf(buffer, "%d|%d", &a, &b) == 2)
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requirements[b][a] = true;
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i64 result = 0;
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while (fgets(buffer, sizeof(buffer), fp))
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{
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BAN::Vector<int> update;
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for (size_t i = 0; isdigit(buffer[i]); i += 3)
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MUST(update.push_back(atoi(&buffer[i])));
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bool valid = true;
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for (size_t i = 0; i < update.size() && valid; i++)
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for (size_t j = i + 1; j < update.size() && valid; j++)
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if (requirements[update[i]][update[j]])
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valid = false;
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if (valid)
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result += update[update.size() / 2];
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}
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return result;
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}
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i64 part2(FILE* fp)
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{
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bool requirements[100][100] {};
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char buffer[128];
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int a, b;
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while (fgets(buffer, sizeof(buffer), fp) && sscanf(buffer, "%d|%d", &a, &b) == 2)
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requirements[b][a] = true;
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i64 result = 0;
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while (fgets(buffer, sizeof(buffer), fp))
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{
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BAN::Vector<int> update;
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for (size_t i = 0; isdigit(buffer[i]); i += 3)
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MUST(update.push_back(atoi(&buffer[i])));
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bool correct { true };
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for (size_t i = 0; i < update.size(); i++)
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{
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for (size_t j = i + 1; j < update.size(); j++)
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{
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if (requirements[update[i]][update[j]])
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{
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BAN::swap(update[i], update[j]);
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correct = false;
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i--;
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break;
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}
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}
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}
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if (!correct)
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result += update[update.size() / 2];
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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/aoc2024/day5_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("part1: %" PRId64 "\n", part1(fp));
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fseek(fp, 0, SEEK_SET);
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printf("part2: %" PRId64 "\n", part2(fp));
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fclose(fp);
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}
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