paste bin

#include <cstdio>

int main(void)
{
    char **pic;
    int R,C,i,j;
    int malicCount,p_x,p_y;
    scanf("%d%d",&R,&C);
    pic=new char* [R];
    for(i=0;i<R;i++)
        pic[i]=new char [C];

    for(i=0;i<R;i++)
    {
        getchar();
        for(j=0;j<C;j++)
            scanf("%c",&pic[i][j]);
    }
    for(j=0;j<C;j++)
    {
        p_x=R;
        p_y=j;
        malicCount=0;
        for(i=R-1;i>=0;i--)
        {
            if(pic[i][j]=='a')
            {
                malicCount++;
                pic[i][j]='.';
            }
            else if(pic[i][j]=='#')
            {
                for(int k=1;k<=malicCount;k++)
                    pic[p_x-k][p_y]='a';
                p_x=i;
                malicCount=0;
            }
        }
        for(int k=1;k<=malicCount;k++)
            pic[p_x-k][p_y]='a';
    }

    for(i=0;i<R;i++)
    {
        for(j=0;j<C;j++)
            printf("%c",pic[i][j]);
        printf("\n");
    }
    for(i=0;i<R;i++)
        delete [] pic[i];
    delete [] pic;
    return 0;
}