#include <cstdlib>
#include <iostream>
#include <string>
#include <algorithm>
using namespace std;
int n,i,d,j;
string s[505],e[505][90],w,w2,a1,a2;

int main(int argc, char *argv[])
{
   cin>>n;
   for(i=0;i<n;i++)
        cin>>s[i];
   string p;
   p=1;

   w="";
   for(i=0;i<n;i++)
     {
            for(j=0;j<s[i].length();j++)
        if(s[i][j]=='\\')
            s[i][j]=1;
    }
   sort(s,s+n);

    for(i=0;i<n;i++)
        {
            d=0;
            for(j=0;j<s[i].length();j++)
            {w2=s[i][j];
            if(w2.compare(p)==0)
                {
                    d++;

                }
            else
                e[i][d]=e[i][d]+s[i][j];  }
        }
    for(j=0;j<80;j++)
        {if(e[0][j]!="")
            {for(d=0;d<j;d++)
            cout<<" ";

         cout<<e[0][j]<<endl;}

         else
             break;
        }
    for(i=1;i<n;i++)
        {a1="";
         a2="";
            for(j=0;j<80;j++)
                {a1=a1+e[i][j];
                a2=a2+e[i-1][j];

                    if(e[i][j]=="")
                    break;

                else if(a1!=a2)
                {       a1="";
                        a2="";
                        a1=a1+e[i][j];
                        a2=a1+e[i-1][j];
                        for(d=0;d<j;d++)
                        cout<<" ";
                    cout<<e[i][j]<<endl;}
                    }
        }

    return 0;
}

I find your mistake.You used c++.You must use delphi.ok?

I got AC