URAL 1008 Image Encoding (BFS)

#include <stdio.h>

#define SIZE 10

int n;

int leftBottomX, leftBottomY;
int x, y;

int image[SIZE + 1][SIZE + 1];


typedef struct{
    int x;
    int y;
} PIXEL;
PIXEL queue[SIZE * SIZE + 1];
int head, tail;

PIXEL pixelPoped, pixelPushed;

int pixelVisited[SIZE + 1][SIZE + 1];

int directions[4][2] = {1, 0, 0, 1, -1, 0, 0, -1};

void BFS1( ){
    int leftBottomPixelFound = 0;
    int indexOfBlack;
    for (indexOfBlack = 1; indexOfBlack <= n; indexOfBlack++){
        scanf("%d %d", &x, &y);
        image[x][y] = 1;
        if (!leftBottomPixelFound){
            leftBottomPixelFound = 1;
            leftBottomX = x;
            leftBottomY = y;

        }
    }

    printf("%d %d
", leftBottomX, leftBottomY);

    pixelPushed.x = leftBottomX;
    pixelPushed.y = leftBottomY;
    pixelVisited[leftBottomX][leftBottomY] = 1;
    queue[tail++] = pixelPushed;

    while (head < tail){
        pixelPoped = queue[head++];
        int indexOfDirection;
        for (indexOfDirection = 0; indexOfDirection < 4; indexOfDirection++){
            x = pixelPoped.x + directions[indexOfDirection][0];
            y = pixelPoped.y + directions[indexOfDirection][1];

            if (image[x][y] == 0 ||
                 x < 1 || x > SIZE ||
                  y < 1 || y > SIZE ||
                   pixelVisited[x][y] == 1)
                continue;

            pixelVisited[x][y] = 1;

            char charPrinted;
            if (indexOfDirection == 0)
                charPrinted = 'R';
            else if (indexOfDirection == 1)
                charPrinted = 'T';
            else if (indexOfDirection == 2)
                charPrinted = 'L';
            else if (indexOfDirection == 3)
                charPrinted = 'B';

            printf("%c", charPrinted);

            pixelVisited[x][y] = 1;
            pixelPushed.x = x;
            pixelPushed.y = y;
            queue[tail++] = pixelPushed;
        }

        printf("%c
", head == tail ? '.' : ',');
    }
}

void BFS2(){

    leftBottomX = n;
    scanf("%d", &leftBottomY);
    image[leftBottomX][leftBottomY] = 1;

    pixelPushed.x = leftBottomX;
    pixelPushed.y = leftBottomY;
    queue[tail++] = pixelPushed;

    while (head < tail){
        pixelPoped = queue[head++];
        char directionStr[6];
        scanf("%s", directionStr);
        int indexOfChar;
        for (indexOfChar = 0; directionStr[indexOfChar] != '\0'; indexOfChar++){

            if (directionStr[indexOfChar] == '.' || directionStr[indexOfChar] == ',')
                break;
            int indexOfDiretion;
            if (directionStr[indexOfChar] == 'R')
                indexOfDiretion = 0;
            else if (directionStr[indexOfChar] == 'T')
                indexOfDiretion = 1;
            else if (directionStr[indexOfChar] == 'L')
                indexOfDiretion = 2;
            else if (directionStr[indexOfChar] == 'B')
                indexOfDiretion = 3;

            x = pixelPoped.x + directions[indexOfDiretion][0];
            y = pixelPoped.y + directions[indexOfDiretion][1];

            if (image[x][y] == 1)
                continue;
            image[x][y] = 1;

            pixelPushed.x = x;
            pixelPushed.y = y;
            queue[tail++] = pixelPushed;
        }
    }

    int numOfBlacks = head;
    printf("%d
", numOfBlacks);
    for (x = 1; x <= SIZE; x++)
        for (y = 1; y <= SIZE; y++)
            if (image[x][y] == 1)
                printf("%d %d
", x, y);

}

int main()
{
    scanf("%d", &n);
    char cha = getchar();
    if (cha == '
')
        BFS1();
    else
        BFS2();

    return 0;
}