Advent-of-Code/2021/day11/solution-part1.c

#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 GRIDROWS 10
#define GRIDCOLS 10

typedef struct Octopus {
	unsigned int energy;
	bool flashed;
} Octopus;

unsigned int flashCount = 0;

void printGrid(Octopus grid[GRIDCOLS][GRIDROWS]);
void flash(Octopus grid[GRIDCOLS][GRIDROWS], int col, int row);
void increaseBy1(Octopus grid[GRIDCOLS][GRIDROWS], int col, int row);
void increaseAllBy1(Octopus grid[GRIDCOLS][GRIDROWS]);
void setToZero(Octopus grid[GRIDCOLS][GRIDROWS]);
void step(Octopus grid[GRIDCOLS][GRIDROWS]);
void resetFlashes(Octopus grid[GRIDCOLS][GRIDROWS]);

void printGrid(Octopus grid[GRIDCOLS][GRIDROWS]){
	for ( unsigned int row = 0; row < GRIDROWS; row++ ){
		for ( unsigned int col = 0; col < GRIDCOLS; col++ ){
			if ( grid[col][row].flashed ) printf(ANSI_COLOR_RED);
			printf("%i", grid[col][row].energy );
			if ( grid[col][row].flashed ) printf(ANSI_COLOR_RESET);
		}
		printf("\n");
	}
}

void flash(Octopus grid[GRIDCOLS][GRIDROWS], int col, int row){
	flashCount++;
	grid[col][row].flashed = true;

	if ( col > 0 ){
		if ( row > 0 ) increaseBy1(grid, col-1, row-1);
		increaseBy1(grid, col-1, row);
		if ( row < GRIDROWS - 1 ) increaseBy1(grid, col-1, row+1);
	}

	if ( row > 0 ) increaseBy1(grid, col, row-1);
	if ( row < GRIDROWS - 1 ) increaseBy1(grid, col, row+1);

	if ( col < GRIDCOLS - 1 ){
		if ( row > 0 ) increaseBy1(grid, col+1, row-1);
		increaseBy1(grid, col+1, row);
		if ( row < GRIDROWS - 1 ) increaseBy1(grid, col+1, row+1);
	}
}

void increaseBy1(Octopus grid[GRIDCOLS][GRIDROWS], int col, int row){
			grid[col][row].energy++;//Increase the enegry
			if ( grid[col][row].energy > 9 && !grid[col][row].flashed ){ // if it hasn't already flashed and is over 9 it should
				flash(grid, col, row);
			}
}

void increaseAllBy1(Octopus grid[GRIDCOLS][GRIDROWS]){
	for ( unsigned int row = 0; row < GRIDROWS; row++ )
		for ( unsigned int col = 0; col < GRIDCOLS; col++ ){
			increaseBy1( grid, col, row );
		}
}


void setToZero(Octopus grid[GRIDCOLS][GRIDROWS]){
	for ( unsigned int row = 0; row < GRIDROWS; row++ )
		for ( unsigned int col = 0; col < GRIDCOLS; col++ )
			if (grid[col][row].energy > 9) grid[col][row].energy = 0;

}

void resetFlashes(Octopus grid[GRIDCOLS][GRIDROWS]){
	for ( unsigned int row = 0; row < GRIDROWS; row++ )
		for ( unsigned int col = 0; col < GRIDCOLS; col++ )
			grid[col][row].flashed = false;
}

void step(Octopus grid[GRIDCOLS][GRIDROWS]){
	increaseAllBy1(grid);
	
	setToZero(grid);
	printGrid(grid);
	resetFlashes(grid);
}

int main( int argc, char *argv[] ){
	if( argc == 2 ) {


		FILE *fp=fopen(argv[1], "r");

		Octopus octopuses[10][10]={0};
		char ch;
		unsigned int row = 0, col=0;
		while ( fscanf( fp, "%c",&ch ) && !feof(fp)){
			if ( ch == '\n' ){
				col=0;
				row++;
			} else {
				octopuses[col++][row].energy = atoi(&ch);
			}
		}

		printGrid(octopuses);
		for ( unsigned int i = 0; i < 100; i++ ){
			printf("\n\n");
			step(octopuses);
		}

		printf("\nThere were %i flashes\n", flashCount);

		fclose(fp);



		return 0;
	} else {
		printf("You need to provide a file\n");
		return 1;
	}
}