commit ec79421a5a9c955ee159e40b0dea1733b8bd1bf5
parent 26f405dd024d8fee2afc30ab5a2a71c76eeca746
Author: bsandro <[email protected]>
Date: Thu, 2 Dec 2021 08:23:27 +0200
Day02, puzzle 1
Diffstat:
5 files changed, 1096 insertions(+), 0 deletions(-)
diff --git a/day02/Makefile b/day02/Makefile
@@ -0,0 +1,23 @@
+NAME=$(shell basename ${PWD})
+CC=cc
+SRC=$(wildcard *.c)
+DEPS:=$(wildcard *.h)
+OBJ:=$(SRC:.c=.o)
+
+CFLAGS=-O0 -std=c99 -g -Werror -Wall -Wextra -I.
+
+all: $(NAME)
+
+.PHONY: clean run
+
+clean:
+ rm -f $(OBJ) $(NAME)
+
+%.o : %.c $(DEPS)
+ $(CC) $(CFLAGS) -c $< -o $@
+
+$(NAME): $(OBJ)
+ $(CC) $(OBJ) -o $@ $(LDFLAGS)
+
+run: $(NAME)
+ ./$(NAME) input.txt
diff --git a/day02/input.txt b/day02/input.txt
@@ -0,0 +1,1000 @@
+forward 5
+down 8
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diff --git a/day02/main.c b/day02/main.c
@@ -0,0 +1,24 @@
+#include <stdio.h>
+#include "puzzle1.h"
+//#include "puzzle2.h"
+
+int main(int argc, char *argv[]) {
+ printf("Advent of Code: day 02\n");
+
+ if (argc <= 0) {
+ return -1;
+ }
+ if (argc <= 1) {
+ printf("Usage: %s inputfile.txt\n", argv[0]);
+ return -1;
+ }
+
+ const char *filename = argv[1];
+
+ int counter1 = puzzle1(filename);
+ printf("Puzzle #1: %d\n", counter1);
+ //int counter2 = puzzle2(filename);
+ //printf("Puzzle #2: %d\n", counter2);
+
+ return 0;
+}
diff --git a/day02/puzzle1.c b/day02/puzzle1.c
@@ -0,0 +1,48 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <string.h>
+#include <strings.h>
+
+#define MAX_LEN 32
+#define MAX_CMD 16
+
+int puzzle1(const char *filename) {
+ FILE *infile = fopen(filename, "r");
+ if (infile == NULL) {
+ fprintf(stderr, "fopen() error: %s\n", strerror(errno));
+ return -1;
+ }
+
+ static const char *cmd_up = "up";
+ static const char *cmd_down = "down";
+ static const char *cmd_forward = "forward";
+ char buf[MAX_LEN] = {0};
+ char cmd[MAX_CMD] = {0};
+ int depth = 0;
+ int distance = 0;
+ int arg = 0;
+
+ while (fgets(buf, MAX_LEN, infile) != NULL) {
+ if (sscanf(buf, "%15s %d", cmd, &arg) == 2) {
+ if (strncmp(cmd, cmd_up, MAX_CMD) == 0) {
+ depth -= arg;
+ } else if (strncmp(cmd, cmd_down, MAX_CMD) == 0) {
+ depth += arg;
+ } else if (strncmp(cmd, cmd_forward, MAX_CMD) == 0) {
+ distance += arg;
+ } else {
+ fprintf(stderr, "Invalid command string");
+ break;
+ }
+
+ bzero(buf, MAX_LEN);
+ bzero(cmd, MAX_CMD);
+ }
+ }
+
+ // mutiny! ignoring feof/ferror.
+
+ fclose(infile);
+ return depth * distance;
+}
diff --git a/day02/puzzle1.h b/day02/puzzle1.h
@@ -0,0 +1 @@
+int puzzle1(const char *filename);
