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#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
void normalize(char *data)
{
for (char *p = data; *p; p++) {
if (*p == '\n' && *(p + 1) == '\n') {
*p = ' ';
p++;
} else if (*p == '\n') {
*p = ' ';
}
}
}
char *valid[] = { "byr", "iyr", "eyr", "hgt", "hcl", "ecl", "pid" };
char *valid_colors[] = { "amb", "blu", "brn", "gry", "grn", "hzl", "oth" };
int part_one(char *data)
{
int res = 0;
int correct = 0;
for (char *p = data; *p; p++) {
if (*p == '\n') {
if (correct == 7)
res++;
correct = 0;
continue;
}
char key[4] = { 0 };
char value[16] = { 0 };
sscanf(p, "%3[^:]:%s ", key, value);
for (int i = 0; i < sizeof(valid) / sizeof(valid[0]); ++i) {
if (!strcmp(key, valid[i])) {
correct++;
break;
}
}
p += 3 + strlen(value) + 1;
if (*(p + 1) == '\0') {
if (correct == 7)
res++;
}
}
return res;
}
#define EQ(a, b) (!strcmp((a), (b))) // String equality
#define BR(x) ((x) >= 1920 && (x) <= 2002) // Birth rule
#define IR(x) ((x) >= 2010 && (x) <= 2020) // Issue rule
#define ER(x) ((x) >= 2020 && (x) <= 2030) // Expiration rule
#define HR(x) ((x) >= 150 && (x) <= 193) // Height rule
#define CR(x) \
(EQ(x, "amb") || EQ(x, "blu") || EQ(x, "brn") || EQ(x, "gry") || EQ(x, "grn") || \
EQ(x, "hzl") || EQ(x, "oth")) // Eye color rule
// BTW: I hate gotos
int part_two(char *data)
{
int res = 0;
int correct = 0;
for (char *p = data; *p; p++) {
if (*p == '\n') {
if (correct == 7)
res++;
correct = 0;
continue;
}
char key[4] = { 0 };
char value[16] = { 0 };
sscanf(p, "%3[^:]:%s ", key, value);
// General value verification/parsing
int y = 0;
if (EQ(key, "byr") || EQ(key, "iyr") || EQ(key, "eyr")) {
if (!sscanf(value, "%4d", &y))
goto invalid;
} else if (EQ(key, "hgt")) {
char last = value[strlen(value) - 1];
if (last == 'm') {
sscanf(value, "%dcm", &y);
} else if (last == 'n') {
sscanf(value, "%din", &y);
y = (int)roundf(((float)y * 2.54)); // lol
} else {
goto invalid;
}
} else if (EQ(key, "hcl") && (strlen(value) != 7 || !sscanf(value, "#%6x", &y))) {
goto invalid;
} else if (EQ(key, "ecl")) {
char c[4];
if (!sscanf(value, "%3s", c) || !CR(c))
goto invalid;
} else if (EQ(key, "pid")) {
if (!sscanf(value, "%9d", &y))
goto invalid;
}
// Number range verification
if (EQ(key, "byr") && !BR(y))
goto invalid;
else if (EQ(key, "iyr") && !IR(y))
goto invalid;
else if (EQ(key, "eyr") && !ER(y))
goto invalid;
else if (EQ(key, "hgt") && !HR(y)) {
goto invalid;
}
for (int i = 0; i < sizeof(valid) / sizeof(valid[0]); ++i) {
if (!strcmp(key, valid[i])) {
correct++;
break;
}
}
goto next;
invalid:
/* printf("Invalid: %s:%s (y=%d)\n", key, value, y); */
correct = -42; // Awesome fix!
next:
p += 3 + strlen(value) + 1;
if (*(p + 1) == '\0') {
if (correct == 7)
res++;
}
}
return res;
}
#define SIZE 20000
int main(int argc, char *argv[])
{
FILE *fp = fopen("input", "r");
if (!fp)
exit(EXIT_FAILURE);
char buf[SIZE] = { 0 };
fread(buf, SIZE, 1, fp);
clock_t tic = clock();
normalize(buf);
printf("%d\n", part_one(buf));
printf("%d\n", part_two(buf));
clock_t toc = clock();
printf("TIME: %f seconds\n", (double)(toc - tic) / CLOCKS_PER_SEC);
fclose(fp);
return 0;
}
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