Помощь с кодом⁠⁠

#include<iostream>
using namespace std;

int main(){
char a[5];
int b[3],c=0,d;
bool n;
cin >> a;
for (int i = 0; a[i] != 0; i++){
d = a[i] - 48;
n = 0;
for (int j = 0; j < c; j++){
if (b[j] == d){
n = 1;
break;
}
}
if (n == 0)
{
b[c] = d;
c++
}
}
switch (c){
case 1:
cout << b[0]<<endl;
break;
case 2:
cout << b[0] << b[1] << " " << b[0] << b[0] << " " << b[1] << b[1]<<" " << b[1] << b[0]<<endl;
break;
case 3:
for (int i = 0; i < 3; i++)
cout << b[i] << b[i] << b[i] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[i] << b[(i+1)%3] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[(i+1)%3] << b[i] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[(i + 1) % 3] << b[(i + 1) % 3] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[i] << b[(i + 2) % 3] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[(i + 1) % 3] << b[(i + 2) % 3] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[(i + 2) % 3] << b[(i + 2) % 3] << " ";
for (int i = 0; i < 3; i++)
cout << b[i] << b[(i + 2) % 3] << b[(i + 1) % 3] << " ";
cout << endl;
break;
}
system("pause");


}