UVa 00114 - Simulation Wizardry (simulation of pinball machine)

Link: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=3&page=show_problem&problem=50
Sol:

/****
	* 114 - Simulation Wizardry
	*/
	#include <stdio.h>
	#include <stdlib.h>
	#define MAX_G 52
	#define MAX_B 49*49
	int grid[MAX_G][MAX_G];
	int n, m;
	typedef struct bumper
	{
	int v;
	int c;
	} bumper;
	void printBoard() {
	int i, j;
	for (i = 0; i < m + 1; i++) {
	for (j = 0; j < n + 1; j++) {
	if (i == m || j == n || i == 1 || j == 1)
	printf("W");
	else
	printf("%d", grid[i][j]);
	}
	printf("\n");
	}
	}
	bumper bumpers[MAX_B];
	int b;
	#define RIGHT 0
	#define LEFT 2
	#define UP 1
	#define DOWN 3
	const int next_direction[4] = { DOWN, RIGHT, UP, LEFT };
	/* | RIGHT | UP | LEFT | DOWN */
	const int x_move[4] = { 1, 0, -1, 0 };
	const int y_move[4] = { 0, 1, 0, -1 };
	int main()
	{
	int wall_cost;
	int direction;
	int lifetime;
	int total_value;
	int value;
	int x, y, new_x, new_y;
	int i;
	#ifndef ONLINE_JUDGE
	freopen("in.txt", "r", stdin);
	//freopen("out.txt", "w", stdout);
	#endif
	memset(grid, 0, sizeof(grid));
	scanf("%d %d", &m, &n);
	scanf("%d", &wall_cost);
	scanf("%d", &b);
	for (i = 1; i <= b; i+=1)
	{
	scanf("%d %d %d %d", &x, &y, &bumpers[i].v, &bumpers[i].c);
	grid[x][y] = i;
	}
	total_value = 0;
	while (scanf("%d %d %d %d", &x, &y, &direction, &lifetime) != EOF)
	{
	value = 0;
	while (--lifetime > 0)
	{
	printf("%d, %d, %d\n", x, y, lifetime);
	new_x = x + x_move[direction];
	new_y = y + y_move[direction];
	/* hit a wall */
	if (new_x == m || new_y == n || new_x == 1 || new_y == 1)
	{
	lifetime -= wall_cost;
	direction = next_direction[direction];
	continue;
	}
	/* hit a bumper */
	if ((i = grid[new_x][new_y]) != 0)
	{
	lifetime -= bumpers[i].c;
	value += bumpers[i].v;
	direction = next_direction[direction];
	continue;
	}
	x = new_x;
	y = new_y;
	} /* while (lifetime >= 0) */
	printf("%d\n", value);
	total_value += value;
	} /* while scanf */
	printf("%d\n", total_value);
	#ifndef ONLINE_JUDGE
	system("pause");
	#endif
	return 0;
	}