commit 0870cb87f14280ff5bc804ce8b7f4be494278fce
parent 9b245784798f928a344ae72ca76b7b26f5474600
Author: bsandro <brian.drosan@gmail.com>
Date: Fri, 17 Dec 2021 03:58:04 +0200
Day 16, puzzle 2
Diffstat:
10 files changed, 102 insertions(+), 31 deletions(-)
diff --git a/day16/Makefile b/day16/Makefile
@@ -1,8 +1,8 @@
NAME=$(shell basename ${PWD})
-SRC=$(wildcard *.c ../common/*.c)
+SRC=$(wildcard *.c)
DEPS:=$(wildcard *.h ../common/*.h)
OBJ:=$(SRC:.c=.o)
-CFLAGS=-O0 -g -std=c99 -Werror -Wall -Wextra -I. -I../common
+CFLAGS=-O2 -std=c99 -Werror -Wall -Wextra -I. -I../common
LDFLAGS=-lc
all: $(NAME)
@@ -22,4 +22,4 @@ run: $(NAME)
@./$(NAME) input.txt
test: $(NAME)
- @./$(NAME) test4.txt
+ @./$(NAME) test.txt
diff --git a/day16/puzzle.c b/day16/puzzle.c
@@ -7,23 +7,31 @@
#include <strings.h>
#include <assert.h>
-#define BUF_SIZE 16
+#define BUF_SIZE 65
struct packet_t {
uint8_t version;
uint8_t type;
- uint32_t value;
+ uint64_t value;
uint16_t packets_size;
struct packet_t **packets;
};
uint8_t hex2int(const int symbol);
char * int2bin(const uint8_t digit);
-uint16_t str2int(char *str, size_t size);
-uint32_t get_value(char *str, size_t *offset);
+uint64_t str2int(char *str, size_t size);
+uint64_t get_value(char *str, size_t *offset);
struct packet_t * get_packet(char *str, size_t *offset);
-uint32_t calc_packet_sum(struct packet_t *packet);
void delete_packet(struct packet_t *packet);
+uint64_t calc_packet_sum(struct packet_t *packet);
+uint64_t calc_packet(struct packet_t *packet);
+uint64_t packet_sum(struct packet_t *packet);
+uint64_t packet_mul(struct packet_t *packet);
+uint64_t packet_min(struct packet_t *packet);
+uint64_t packet_max(struct packet_t *packet);
+uint64_t packet_gt(struct packet_t *packet);
+uint64_t packet_lt(struct packet_t *packet);
+uint64_t packet_eq(struct packet_t *packet);
void puzzle(const char *filename, long long *result1, long long *result2) {
FILE *infile = fopen(filename, "r");
@@ -54,8 +62,8 @@ void puzzle(const char *filename, long long *result1, long long *result2) {
size_t offset = 0;
struct packet_t *packet = get_packet(binary, &offset);
assert(packet != NULL);
- //printf("final offset: %zu\n", offset);
*result1 = calc_packet_sum(packet);
+ *result2 = calc_packet(packet);
delete_packet(packet);
free(binary);
@@ -63,7 +71,7 @@ void puzzle(const char *filename, long long *result1, long long *result2) {
fclose(infile);
}
-uint32_t calc_packet_sum(struct packet_t *packet) {
+uint64_t calc_packet_sum(struct packet_t *packet) {
uint32_t sum = packet->version;
if (packet->type != 4) {
for (uint16_t i = 0; i < packet->packets_size; ++i) {
@@ -73,6 +81,85 @@ uint32_t calc_packet_sum(struct packet_t *packet) {
return sum;
}
+uint64_t calc_packet(struct packet_t *packet) {
+ switch (packet->type) {
+ case 0:
+ return packet_sum(packet);
+ case 1:
+ return packet_mul(packet);
+ case 2:
+ return packet_min(packet);
+ case 3:
+ return packet_max(packet);
+ case 4:
+ return packet->value;
+ case 5:
+ return packet_gt(packet);
+ case 6:
+ return packet_lt(packet);
+ case 7:
+ return packet_eq(packet);
+ }
+ return 0;
+}
+
+uint64_t packet_sum(struct packet_t *packet) {
+ uint64_t val = 0;
+ for (uint16_t i = 0; i < packet->packets_size; ++i) {
+ val += calc_packet(packet->packets[i]);
+ }
+ return val;
+}
+
+uint64_t packet_mul(struct packet_t *packet) {
+ uint64_t val = 1;
+ for (uint16_t i = 0; i < packet->packets_size; ++i) {
+ val *= calc_packet(packet->packets[i]);
+ }
+ return val;
+}
+
+uint64_t packet_min(struct packet_t *packet) {
+ assert(packet->packets_size > 0);
+ uint64_t val = calc_packet(packet->packets[0]);
+ for (uint16_t i = 1; i < packet->packets_size; ++i) {
+ uint64_t v = calc_packet(packet->packets[i]);
+ val = v < val ? v : val;
+ }
+ return val;
+}
+
+uint64_t packet_max(struct packet_t *packet) {
+ assert(packet->packets_size > 0);
+ uint64_t val = 0;
+ for (uint16_t i = 0; i < packet->packets_size; ++i) {
+ uint64_t v = calc_packet(packet->packets[i]);
+ val = v > val ? v : val;
+ }
+ return val;
+}
+
+uint64_t packet_gt(struct packet_t *packet) {
+ assert(packet->packets_size == 2);
+ uint64_t v1 = calc_packet(packet->packets[0]);
+ uint64_t v2 = calc_packet(packet->packets[1]);
+ return v1 > v2 ? 1 : 0;
+}
+
+uint64_t packet_lt(struct packet_t *packet) {
+ assert(packet->packets_size == 2);
+ uint64_t v1 = calc_packet(packet->packets[0]);
+ uint64_t v2 = calc_packet(packet->packets[1]);
+ return v1 < v2 ? 1 : 0;
+}
+
+uint64_t packet_eq(struct packet_t *packet) {
+ assert(packet->packets_size == 2);
+ uint64_t v1 = calc_packet(packet->packets[0]);
+ uint64_t v2 = calc_packet(packet->packets[1]);
+ return v1 == v2 ? 1 : 0;
+}
+
void delete_packet(struct packet_t *packet) {
if (packet->type != 4) {
for (uint16_t i = 0; i < packet->packets_size; ++i) {
@@ -102,20 +189,16 @@ char * int2bin(const uint8_t digit) {
return bin;
}
-uint16_t str2int(char *str, size_t size) {
+uint64_t str2int(char *str, size_t size) {
assert(size < BUF_SIZE);
-
static char data[BUF_SIZE] = {0};
strlcpy(data, str, size+1);
-
return strtoull(data, NULL, 2);
}
struct packet_t * get_packet(char *str, size_t *offset) {
struct packet_t *packet = malloc(sizeof(struct packet_t));
bzero(packet, sizeof(struct packet_t));
-
- //printf("%s\n", str);
size_t total_offset = 0;
packet->version = str2int(str+total_offset, 3);
@@ -123,13 +206,9 @@ struct packet_t * get_packet(char *str, size_t *offset) {
packet->type = str2int(str+total_offset, 3);
total_offset += 3;
- //printf("type: %u\n", packet->type);
- //printf("version: %u\n", packet->version);
-
if (packet->type == 4) { // literal values type
size_t local_offset = 0;
packet->value = get_value(str+total_offset, &local_offset);
- //printf("value: %u\n", packet->value);
total_offset += local_offset;
} else { // operator packet
@@ -139,7 +218,6 @@ struct packet_t * get_packet(char *str, size_t *offset) {
if (len_type == 0) { // next 15 bits are length in bits
len = str2int(str+total_offset, 15);
- //printf("length nested packets: %u bits\n", len);
total_offset += 15;
size_t sum_offset = 0;
@@ -158,7 +236,6 @@ struct packet_t * get_packet(char *str, size_t *offset) {
} else { // next 11 bits are number of packets
len = str2int(str+total_offset, 11);
total_offset += 11;
- //printf("number of nested packets: %u\n", len);
packet->packets_size = len;
packet->packets = calloc(len, sizeof(void *));
for (uint16_t i = 0; i < len; ++i) {
@@ -176,14 +253,14 @@ struct packet_t * get_packet(char *str, size_t *offset) {
return packet;
}
-uint32_t get_value(char *str, size_t *offset) {
- uint32_t value = 0;
+uint64_t get_value(char *str, size_t *offset) {
+ uint64_t value = 0;
size_t local_offset = 0;
uint16_t flag = 1;
while (flag == 1) {
flag = str2int(str+local_offset, 1);
local_offset += 1;
- uint16_t val = str2int(str+local_offset, 4);
+ uint64_t val = str2int(str+local_offset, 4);
value = (value << 4) + val;
local_offset += 4;
}
diff --git a/day16/test.txt b/day16/test.txt
@@ -0,0 +1 @@
+9C0141080250320F1802104A08
diff --git a/day16/test1.txt b/day16/test1.txt
@@ -1 +0,0 @@
-D2FE28
diff --git a/day16/test2.txt b/day16/test2.txt
@@ -1 +0,0 @@
-38006F45291200
diff --git a/day16/test3.txt b/day16/test3.txt
@@ -1 +0,0 @@
-EE00D40C823060
diff --git a/day16/test4.txt b/day16/test4.txt
@@ -1 +0,0 @@
-8A004A801A8002F478
diff --git a/day16/test5.txt b/day16/test5.txt
@@ -1 +0,0 @@
-620080001611562C8802118E34
diff --git a/day16/test6.txt b/day16/test6.txt
@@ -1 +0,0 @@
-C0015000016115A2E0802F182340
diff --git a/day16/test7.txt b/day16/test7.txt
@@ -1 +0,0 @@
-A0016C880162017C3686B18A3D4780
