finished 4a

3/main.c

@@ -12,7 +12,7 @@ struct instruction {
 
 void addInstruction(struct instruction *start, char *coord)
 {
-	// traverse list until null next
+	// traverse list until last member
 	while(start->next) start = start->next;
 	
 	// allocate and store ptr
@@ -24,8 +24,6 @@ void addInstruction(struct instruction *start, char *coord)
 }
 
 bool confirm_numbers(char *start, char *end) {
-	if (start >= end)
-		return 0;
 	for (int i = 0; (start[i] >= '0' && start[i] <= '9') || start[i] == ','; i++) {
 		if (start[i + 1 ] == ')')
 			return 1;
@@ -51,31 +49,24 @@ int parse_numbers(char *string)
 	return a * b;
 }
 
-int find_coord(char *instructions, int start)
-{
-	return 1;
-}
-
-
 int main()
 {
 	unsigned int sum = 0;
 	char instructions[32];
-	int a = 0;
-	int b = 0;
 	
 	FILE *input;
 	input = fopen("./input", "r");
 
 	fseek(input, 0L, SEEK_END);
 	unsigned int fLen = ftell(input);
-	char *memory = malloc(fLen * sizeof(char));
+	char *memory = malloc(fLen * sizeof(char) + 1);
 
 	rewind(input);
 	fread(memory, fLen, sizeof(char), input);
+	memory[fLen + 1] = '\0';
 	fclose(input);
 	
-	// find first instruction for the list head
+	// find first instruction start for the list head
 	char *start = memory;
 	start = strstr(start, "mul(") + 4;
 	struct instruction *list = malloc(sizeof(struct instruction));
@@ -97,6 +88,5 @@ int main()
 		current = current->next;
 	}
 
-	printf("%d, %d\n", a, b);
 	printf("%d\n", sum);
 }

3/mainB.c

@@ -0,0 +1,92 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdbool.h>
+
+#define LINES 1000
+
+struct instruction {
+	char *coord;
+	struct instruction *next;
+};
+
+void addInstruction(struct instruction *start, char *coord)
+{
+	// traverse list until last member
+	while(start->next) start = start->next;
+	
+	// allocate and store ptr
+	start->next = malloc(sizeof(struct instruction));
+	
+	// store coords in new item
+	start->next->coord = coord;
+	start->next->next = 0;
+}
+
+bool confirm_numbers(char *start, char *end) {
+	for (int i = 0; (start[i] >= '0' && start[i] <= '9') || start[i] == ','; i++) {
+		if (start[i + 1 ] == ')')
+			return 1;
+	}
+	return 0;
+}
+
+int parse_numbers(char *string)
+{
+	int i = 0;
+	int a = 0;
+	int b = 0;
+	while (string[i] >= '0' && string[i] <= '9') {
+		a = a * 10 + string[i] - '0';
+		i++;
+	}
+	// skip comma!
+	i++;
+	while (string[i] >= '0' && string[i] <= '9') {
+		b = b * 10 + string[i] - '0';
+		i++;
+	}
+	return a * b;
+}
+
+int main()
+{
+	unsigned int sum = 0;
+	char instructions[32];
+	
+	FILE *input;
+	input = fopen("./input", "r");
+
+	fseek(input, 0L, SEEK_END);
+	unsigned int fLen = ftell(input);
+	char *memory = malloc(fLen * sizeof(char) + 1);
+
+	rewind(input);
+	fread(memory, fLen, sizeof(char), input);
+	memory[fLen + 1] = '\0';
+	fclose(input);
+	
+	// find first instruction start for the list head
+	char *start = memory;
+	start = strstr(start, "mul(") + 4;
+	struct instruction *list = malloc(sizeof(struct instruction));
+	list->coord = start;
+	list->next = 0;
+
+	// find the rest of the instructions and append to the linked list
+	while (start = strstr(start, "mul(")) {
+		start = start + 4;
+		// confirm format %d,%d)
+		if (confirm_numbers(start, memory + fLen))
+			addInstruction(list, start);
+	}
+
+	// from each instruction start, parse and mult numbers
+	struct instruction *current = list;
+	while (current) {
+		sum += parse_numbers(current->coord);
+		current = current->next;
+	}
+
+	printf("%d\n", sum);
+}

4/'

@@ -0,0 +1,41 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<string.h>
+#include<stdbool.h>
+
+int xmas_detector(char *x)
+{
+	int directions[8][2] = {{-1, -1}, {0, -1}, {1, -1}, {1, 0},
+		{1, 1}, {0, 1}, {-1, 1}, {-1, 0}};
+	for (int i = 0; i < 8; i++) {
+		for (int j = 0; j < 3; j++) {
+			
+		}
+	}
+}
+
+int main ()
+{
+	// make 2d array
+	FILE *input = fopen("./inputDemo", "r");
+	int width =  0;
+	int height = 1;
+	while (fgetc(input) != '\n') width++;
+	for (char c = fgetc(input); c != EOF; c = fgetc(input)) {
+		if (c == '\n')
+			height++;
+	}
+	printf("%d\n%d\n", width, height);
+
+	char **grid = malloc(width);
+	grid[0] = malloc(width * height);
+	for (int i = 1; i < width; i++) {
+		grid[i] = grid[0] + i * height;
+	}
+
+	grid[0][2] = '5';
+
+	// find x
+	//
+	// confirm mas in all 8 directions
+}

4/input

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4/inputDemo

@@ -0,0 +1,10 @@
+MMMSXXMASM
+MSAMXMSMSA
+AMXSXMAAMM
+MSAMASMSMX
+XMASAMXAMM
+XXAMMXXAMA
+SMSMSASXSS
+SAXAMASAAA
+MAMMMXMMMM
+MXMXAXMASX

4/main.c

@@ -0,0 +1,75 @@
+#include<stdlib.h>
+#include<stdio.h>
+#include<string.h>
+#include<stdbool.h>
+
+int xmas_detector(char **grid, int x, int y, int width)
+{
+	int real_xmas = 0;
+	char MAS[3] = {'M', 'A', 'S'};
+	int dir[8][2] =
+		{{-1, -1}, {0, -1}, {1, -1}, {1, 0},
+		{1, 1}, {0, 1}, {-1, 1}, {-1, 0}};
+	for (int i = 0; i < 8; i++) {
+		if (x + dir[i][0] * 3 < 0 ||
+		    y + dir[i][1] * 3 < 0 ||
+		    x + dir[i][0] * 3 >= width ||
+		    y + dir[i][1] * 3 >= width)
+			continue;
+		for (int j = 1; j <= 3; j++) {
+			// holy can you read that coordinate?
+			if (grid[x + dir[i][0] * j][y + dir[i][1] * j] != MAS[j - 1])
+				break;
+			else if (j == 3)
+				real_xmas++;
+		}
+	}
+
+	return real_xmas;
+}
+
+int main ()
+{
+	// figure out data dimensions
+	FILE *input = fopen("./input", "r");
+	int width =  0;
+	int height = 1;
+	while (fgetc(input) != '\n') width++;
+	for (char c = fgetc(input); c != EOF; c = fgetc(input)) {
+		if (c == '\n')
+			height++;
+	}
+	rewind(input);
+	printf("Dimensions: %d x %d\n", width, height);
+
+	// make 2d array
+	char **grid = malloc(width * sizeof(char*));
+	grid[0] = malloc(width * height);
+	for (int i = 1; i < width; i++) {
+		grid[i] = grid[0] + i * height;
+	}
+
+	// put the data in the array
+	for (int i = 0; i < width; i++) {
+		for (int j = 0; j < height; j++) {
+			grid[i][j] = fgetc(input);
+		}
+		// skip newline
+		fgetc(input);
+	}
+	fclose(input);
+
+	// find x
+	int sum_xmas = 0;
+	for (int i = 0; i < width; i++) {
+		for (int j = 0; j < height; j++) {
+			if (grid[i][j] == 'X')
+				// confirm mas in all 8 dir
+				sum_xmas += xmas_detector(grid, i, j, width);
+		}
+	}
+	
+	printf("total xmases: %d\n", sum_xmas);
+	free(grid[0]);
+	free(grid);
+}