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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#define MAX(x, y) (((x) > (y)) ? (x) : (y))
#define MIN(x, y) (((x) < (y)) ? (x) : (y))
#if 0
#define PART_1
#else
#define PART_2
#endif
#if 0
#define FILE_PATH "example.txt"
#define WIDTH 10
#define HEIGHT 10
#else
#define FILE_PATH "input.txt"
#define WIDTH 10000
#define HEIGHT 10000
#endif
int board[WIDTH][HEIGHT] = {0};
void draw_line(int x1, int y1, int x2, int y2)
{
if(x1 == x2)
{
for(int y = MIN(y1, y2); y <= MAX(y1, y2); y++)
board[x1][y]++;
}
else if(y1 == y2)
{
for(int x = MIN(x1, x2); x <= MAX(x1, x2); x++)
board[x][y1]++;
}
#ifdef PART_2
else
{
int direction_x = (x1 < x2) ? 1 : -1;
int direction_y = (y1 < y2) ? 1 : -1;
int y = y1;
int x = x1;
while(!((y == y2) && (x == x2)))
{
board[x][y]++;
x+=direction_x;
y+=direction_y;
}
}
#endif
}
void parse()
{
FILE *fp = fopen(FILE_PATH, "r");
if(!fp) {
fprintf(stderr, "ERROR: Could not open file: %s", FILE_PATH);
exit(EXIT_FAILURE);
}
char *vec1, *vec2;
char line[256];
while(fgets(line, sizeof(line), fp) != NULL)
{
vec1 = strtok(line, " -> ");
vec2 = strtok(NULL, " -> ");
int x1, y1, x2, y2;
x1 = atoi(strtok(vec1, ","));
y1 = atoi(strtok(NULL, ","));
x2 = atoi(strtok(vec2, ","));
y2 = atoi(strtok(NULL, ","));
draw_line(x1, y1, x2, y2);
}
}
void print_board()
{
for(int i = 0; i < HEIGHT; i++)
{
for(int j = 0; j < WIDTH; j++)
{
if(board[j][i] == 0)
putc('.', stdout);
else if(board[j][i] == 1)
putc('#', stdout);
else
putc('@', stdout);
}
putc('\n', stdout);
}
}
void part_1()
{
parse();
int count = 0;
for(int i = 0; i < HEIGHT; i++)
for(int j = 0; j < WIDTH; j++)
if(board[j][i] >= 2) count++;
printf("Count is %d\n", count);
}
void part_2()
{
parse();
int count = 0;
for(int i = 0; i < HEIGHT; i++)
for(int j = 0; j < WIDTH; j++)
if(board[j][i] >= 2) count++;
// print_board();
printf("Count is %d\n", count);
}
int main(void)
{
#ifdef PART_1
part_1();
#endif
#ifdef PART_2
part_2();
#endif
return 0;
}
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