#include <stdio.h>
#include <stdlib.h>

void umple(char des[20][40], int x, int y, char c)
{
        if(des[x][y]==' ') des[x][y]=c;
        if(des[x][y-1]==' ') umple(des,x,y-1,c);
        if(des[x-1][y]==' ') umple(des,x-1,y,c);
        if(des[x][y+1]==' ') umple(des,x,y+1,c);
        if(des[x+1][y]==' ') umple(des,x+1,y,c);
}

int main(void)
{
        int lin,col,i,j;
        char charsel;
        char desen[20][40];
        FILE *filein=NULL,*fileout=NULL;

        filein=fopen("in","rt");
        fileout=fopen("out","wt");

        for(i=0;i<20;i++)
        {
                for(j=0;j<40;j++)
                desen[i][j]=getc(filein);
        }

        printf("Introduceti numarul liniei si coloanei unde doriti sa efectuati umplerea\n");
        scanf("%d %d",&lin,&col);

        printf("Introduceti caracterul de umplere, diferit de spatiu\n");
        scanf("%c",&charsel);

        umple(desen,lin,col,charsel);

        for(i=1;i<20;i++)
        {
                for(j=0;j<40;j++)
                fprintf(fileout, "%c", desen[i][j]);
        };
        printf("Rezultatul a fost scris in fisierul 'out'");
        getchar();
        return 0;
}