Restore aoc backup.

2015/day02/answer01.c

@@ -0,0 +1,53 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h>
+
+int32_t compint(const void *a, const void *b) {
+	uint16_t tmp_a = *((uint16_t *)a);
+	uint16_t tmp_b = *((uint16_t *)b);
+
+	if (tmp_a == tmp_b) return 0;
+	else if (tmp_a > tmp_b) return 1;
+	else return -1;
+}
+
+int main() {
+	FILE *file = fopen("input", "r");
+	if (file == NULL) {
+		perror("main: Error opening file.");
+		return 1;
+	}
+
+	uint16_t l, w, h, sa_tmp;
+	uint32_t sa_cum = 0;
+	int8_t buffer[256];
+	while (fgets(buffer, sizeof(buffer), file) != NULL) {
+		if (sscanf(buffer, "%hux%hux%hu", &l, &w, &h) != 3) {
+			perror("main: Error parsing string.");
+			return 1;
+		}
+		else {
+			//calculate surface area
+			sa_tmp = 2*l*w + 2*w*h + 2*l*h;
+
+			//calculate smallest side
+			uint16_t array[3] = {l, w, h};
+			uint16_t n = sizeof(array)/sizeof(array[0]);
+			qsort(array, n, sizeof(array[0]), compint);
+
+			//calculate cumulative surface area
+			sa_cum = sa_cum + sa_tmp + (array[0]*array[1]);
+		}
+	}
+	if (ferror(file)) {
+		perror("main: Error reading from file.");
+		return 1;
+	}
+	fclose(file);
+
+	printf("cumulative surface area: %u\n", sa_cum);
+
+	return 0;
+}
+			

2015/day02/answer02.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <string.h> 
+
+int32_t compint(const void *a, const void *b) {
+	uint16_t tmp_a = *((uint16_t *)a);
+	uint16_t tmp_b = *((uint16_t *)b);
+
+	if (tmp_a == tmp_b) return 0;
+	else if (tmp_a > tmp_b) return 1;
+	else return -1;
+}	
+
+int main() {
+	FILE *file = fopen("input", "r");
+	if (file == NULL) {
+		perror("main: Error opening file.");
+		return 1;
+	}
+
+	uint16_t l, w, h, sp_tmp;
+	uint32_t ribbon = 0;
+	int8_t buffer[256];
+	while (fgets(buffer, sizeof(buffer), file) != NULL) {
+		if (sscanf(buffer, "%hux%hux%hu", &l, &w, &h) != 3) {
+			perror("main: Error parsing string.");
+			return 1;
+		}
+		else {
+			//calculate shortest perimeter
+			uint16_t array[3] = {l, w, h};
+			uint16_t n = sizeof(array)/sizeof(array[0]);
+			qsort(array, n, sizeof(array[0]), compint);
+			sp_tmp = 2*array[0] + 2*array[1];
+
+			//calculate cubic volume
+			uint16_t cv = l*w*h;
+
+			//calculate cumulative ribbon length
+			ribbon = ribbon + sp_tmp + cv;
+		}
+	}
+	if (ferror(file)) {
+		perror("main: Error reading from file.");
+		return 1;
+	}
+	fclose(file);
+
+	printf("total ribbon length: %u\n", ribbon);
+
+	return 0;
+}
+
+
+

2015/day02/makefile

@@ -0,0 +1,10 @@
+CC = gcc
+CFLAGS = -std=c99 -Wall -g
+LDFLAGS =
+
+answer01: answer01.c
+	$(CC) answer01.c -o answer01
+
+answer02: answer02.c
+	$(CC) answer02.c -o answer02
+