Restore aoc backup.

2015/day05/answer01.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+int main() {
+	//load input string
+	FILE *file = fopen("input", "r");
+	if (file == NULL) {
+		perror("main: error opening file.");
+		return -1;
+	}
+
+	//string exclusions
+	char *ab = "ab";
+	char *cd = "cd";
+	char *pq = "pq";
+	char *xy = "xy";
+
+	uint32_t ncount = 0;
+	uint8_t double_check = 0;
+	uint8_t vowel_check = 0;
+	char input[256];
+	while (fgets(input, sizeof(input), file) != NULL) {
+		//string exclusion test
+		if (strstr(input, ab) || strstr(input, cd) || strstr(input, pq) || strstr(input, xy)) {
+			continue;
+		}
+
+		//double letter test
+		double_check = 0;
+		for (uint8_t i = 0; i < strlen(input); i++) {
+			if (input[i] == input[i+1]) {
+				double_check = 1;
+				break;
+			}
+		}
+
+		//three vowel test
+		vowel_check = 0;
+		for (uint8_t i = 0; i < strlen(input); i++) {
+		    if (input[i] == 'a' || input[i] == 'e' || input[i] == 'i' || input[i] == 'o' || input[i] == 'u')
+				vowel_check++;
+		}
+
+		if (double_check == 1 && vowel_check >= 3)
+			ncount++;
+	}
+	if (ferror(file)) {		
+		perror("main: error reading file.");
+		return -1;
+	}
+
+	printf("ncount: %i\n", ncount);
+	return 0;
+}
+

2015/day05/answer02.c

@@ -0,0 +1,47 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+
+int main() {
+	//load input string
+	FILE *file = fopen("input", "r");
+	if (file == NULL) {
+		perror("main: error opening file.");
+		return -1;
+	}
+
+	uint32_t ncount = 0;
+	uint8_t two_repeating_check = 0;
+	uint8_t two_separated_check = 0;
+	char input[256];
+	while (fgets(input, sizeof(input), file) != NULL) {
+		
+		//two letters repeating test
+		two_repeating_check = 0;
+		for (uint8_t i = 0; i < strlen(input) - 1; i++) {
+			for (uint8_t j = i + 2; j < strlen(input) - 1; j++) {
+				if (input[i] == input[j] && input[i+1] == input[j+1])
+					two_repeating_check = 1;
+			}
+		}
+
+		//two letters separated by one test
+		two_separated_check = 0;
+		for (uint8_t i = 0; i < strlen(input) - 1; i++) {
+			if (input[i] == input[i+2])
+				two_separated_check = 1;
+		}
+
+		if (two_repeating_check && two_separated_check)
+			ncount++;
+	}
+	if (ferror(file)) {		
+		perror("main: error reading file.");
+		return -1;
+	}
+
+	printf("ncount: %i\n", ncount);
+	return 0;
+}
+

2015/day05/makefile

@@ -0,0 +1,10 @@
+CC = gcc
+CFLAGS = -std=c99 -Wall -g
+LDFLAGS = 
+
+1: answer01.c
+	$(CC) $(CFLAGS) $(LDFLAGS) answer01.c -o answer01
+
+2: answer02.c
+	$(CC) $(CFLAGS) $(LDFLAGS) answer02.c -o answer02
+