Day 13

day13/solution-part2.c

@@ -0,0 +1,102 @@
+#include <stdio.h>
+#include <stdbool.h>
+#include <string.h>
+#include <stdlib.h>
+
+#define ANSI_COLOR_RED     "\x1b[31m"
+#define ANSI_COLOR_YELLOW  "\x1b[33m"
+#define ANSI_COLOR_RESET   "\x1b[0m"
+
+#define MAX(a, b) ((a) < (b) ? (b) : (a))
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+
+void printPaper( unsigned int width, unsigned int height, bool **paper ){
+	for ( unsigned int y = 0; y < height; y++ ){
+		printf("Line %i: ", y);
+		for ( unsigned int x = 0; x < width; x++ ){
+			if ( paper[x][y] == true ) printf("#");
+			else printf(".");
+		}
+		printf("\n");
+	}
+}
+
+
+bool** foldPaperX( unsigned int width, unsigned int height, unsigned int col, bool **paper){
+	bool **newPaper=(bool**)malloc( col * sizeof(bool *));
+	for(unsigned int x=0; x < col;x++) {
+		newPaper[x]=(bool*)malloc( (height) *sizeof(bool));
+		memset(newPaper[x], 0, sizeof(bool) * ( height ));
+	}
+	for ( unsigned int x = 1; x < width - col; x++ )
+		for ( unsigned int y=0; y < height; y++ )
+			newPaper[col - x][y] = paper[col - x][y] || paper[col + x][y];
+	return newPaper;
+}
+
+bool** foldPaperY( unsigned int width, unsigned int height, unsigned int row, bool **paper){
+	bool **newPaper=(bool**)malloc( (width) * sizeof(bool *));
+	for(unsigned int x=0; x < width; x++) {
+		newPaper[x]=(bool*)malloc( (row) *sizeof(bool));
+		memset(newPaper[x], 0, sizeof(bool) * ( row ));
+	}
+	for ( unsigned int y=1; y < height - row; y++ )
+		for ( unsigned int x = 0; x < width; x++ )
+			newPaper[x][row - y] = ( paper[x][row - y] || paper[x][row + y] );
+	return newPaper;
+}
+
+int main( int argc, char *argv[] ){
+	if( argc == 2 ) {
+
+		FILE *fp=fopen(argv[1], "r");
+
+		unsigned int x=0,y=0,maxx=0,maxy=0;
+		while ( fscanf( fp, "%i,%i\n",&x,&y )){
+			maxx = MAX(maxx,x);
+			maxy = MAX(maxy,y);
+		}
+
+		printf("Max x: %i Max y: %i\n", maxx, maxy);
+
+		bool **paper=(bool**)malloc( (maxx+1) * sizeof(bool *));
+		for(unsigned int i=0; i<=maxx;i++)
+		{
+			paper[i]=(bool*)malloc( (maxy+1) *sizeof(bool));
+			memset(paper[i], 0, sizeof(bool) * ( maxy+1 ));
+		}
+
+		rewind(fp);
+		while ( fscanf( fp, "%i,%i\n",&x,&y )){
+			paper[x][y] = true;
+		}
+
+		printPaper( maxx+1, maxy+1, paper );
+		printf("\n");
+
+
+		char direction = '\0';
+		unsigned int position = 0;
+		while (!feof(fp) && fscanf(fp, "fold along %c=%i\n", &direction, &position)){
+			printf("Trying to fold in %c direction at position %i\n", direction, position);
+			if ( direction == 'x' ){
+				paper = foldPaperX(maxx+1, maxy+1, position, paper);
+				maxx = position - 1;
+				printPaper( maxx + 1, maxy + 1, paper );
+			} else {
+				paper = foldPaperY(maxx+1, maxy+1, position, paper);
+				maxy = position - 1;
+				printPaper( maxx+1, maxy+1, paper );
+			}
+			
+		}
+
+
+		fclose(fp);
+
+		return 0;
+	} else {
+		printf("You need to provide a file\n");
+		return 1;
+	}
+}