88 lines
1.3 KiB
C++
88 lines
1.3 KiB
C++
#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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int amount;
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char direction;
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i32 value = 50;
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i32 result = 0;
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while (fscanf(fp, "%c%d\n", &direction, &amount) == 2)
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{
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switch (direction)
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{
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case 'L':
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value = (value - amount) % 100;
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break;
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case 'R':
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value = (value + amount) % 100;
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break;
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}
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if (value == 0)
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result++;
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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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int amount;
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char direction;
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i32 value = 50;
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i32 result = 0;
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while (fscanf(fp, "%c%d\n", &direction, &amount) == 2)
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{
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switch (direction)
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{
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case 'L':
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if (amount >= value)
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result += (value != 0) + (amount - value) / 100;
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value = (((value - amount) % 100) + 100) % 100;
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break;
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case 'R':
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result += (value + amount) / 100;
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value = (value + amount) % 100;
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break;
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}
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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/aoc2025/day1_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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