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Day 3 part 2 complete!

This commit is contained in:
Alexander Andreev 2023-12-03 18:27:32 +04:00
parent 61fe20524b
commit fabaaffe11
Signed by: Arav
GPG Key ID: D22A817D95815393
3 changed files with 120 additions and 2 deletions
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2
Makefile
View File

@ -19,7 +19,7 @@ day2: day2/p1.c day2/p2.c
day3: day3/p1.c day3/p2.c
${CC} ${CFLAGS} $@/p1.c -o bin/$@p1
# ${CC} ${CFLAGS} $@/p2.c -o bin/$@p2
${CC} ${CFLAGS} $@/p2.c -o bin/$@p2
clean:
rm -f bin/day*p*

115
day3/p2.c Normal file
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@ -0,0 +1,115 @@
#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <stdint.h>
#include <stdbool.h>
#include <ctype.h>
int32_t parse_number(char **engine, ssize_t i, ssize_t j);
int main(int argc, char **argv) {
FILE *input;
char *line = NULL;
size_t line_length = 0;
if (argc == 1 || argv[1][0] == '-')
input = stdin;
else if ((input = fopen(argv[1], "r")) == NULL) {
printf("Cannot open file %s\n", argv[1]);
return -1;
}
char **engine = NULL;
ssize_t engine_line_size = 0;
ssize_t engine_lines = 0;
while (getline(&line, &line_length, input) != -1) {
ssize_t len = strlen(line)-1;
if (engine == NULL) {
engine = (char **) calloc(len, sizeof(char*));
engine_line_size = len;
}
engine[engine_lines] = (char*) calloc(len, sizeof(char));
memcpy(engine[engine_lines], line, len);
++engine_lines;
memset(line, 0, line_length);
}
int32_t part_number = 0;
for (ssize_t i = engine_lines-1; i >= 0; --i) {
for (ssize_t j = engine_line_size-1; j >= 0; --j) {
if (engine[i][j] != '*')
continue;
int32_t n = 1;
int8_t p = 0;
if (isdigit(engine[i][j+1])) {
n *= parse_number(engine, i, j+1);
p++;
}
if (isdigit(engine[i][j-1])) {
n *= parse_number(engine, i, j-1);
p++;
}
if (isdigit(engine[i+1][j])) {
n *= parse_number(engine, i+1, j);
p++;
} else {
if (isdigit(engine[i+1][j+1])) {
n *= parse_number(engine, i+1, j+1);
p++;
}
if (isdigit(engine[i+1][j-1])) {
n *= parse_number(engine, i+1, j-1);
p++;
}
}
if (isdigit(engine[i-1][j])) {
n *= parse_number(engine, i-1, j);
p++;
} else {
if (isdigit(engine[i-1][j+1])) {
n *= parse_number(engine, i-1, j+1);
p++;
}
if (isdigit(engine[i-1][j-1])) {
n *= parse_number(engine, i-1, j-1);
p++;
}
}
if (p >= 2)
part_number += n;
}
}
for (ssize_t i = 0; i < engine_lines; ++i)
free(engine[i]);
free(engine);
printf("%d\n", part_number);
return 0;
}
int32_t parse_number(char **engine, ssize_t i, ssize_t j) {
int32_t n = 0;
int32_t multiplier = 1;
while (isdigit(engine[i][j+1])) j++;
while (isdigit(engine[i][j])) {
n += (engine[i][j]&0xf) * multiplier;
multiplier *= 10;
j--;
}
return n;
}

5
test
View File

@ -10,4 +10,7 @@ echo "Day 1 with test data part 1 $(test_case 1 1 "test" "142"), and part 2 $(te
echo "Day 1 with my data part 1 $(test_case 1 1 "my" "55621"), and part 2 $(test_case 1 2 "my" "53592").";
echo "Day 2 with test data part 1 $(test_case 2 1 "test" "8"), and part 2 $(test_case 2 2 "test" "2286").";
echo "Day 2 with my data part 1 $(test_case 2 1 "my" "2727"), and part 2 $(test_case 2 2 "my" "56580").";
echo "Day 2 with my data part 1 $(test_case 2 1 "my" "2727"), and part 2 $(test_case 2 2 "my" "56580").";
echo "Day 3 with test data part 1 $(test_case 3 1 "test" "4361"), and part 2 $(test_case 3 2 "test" "467835").";
echo "Day 3 with my data part 1 $(test_case 3 1 "my" "550934"), and part 2 $(test_case 3 2 "my" "81997870").";