#include <stdio.h>

int Kol_variantov=0;

void func(int n, int k, char mass[], char* Arr, int pos, int kol) { 
     int z,i,j;
     if(n==1) {
              for(j=0; j<36; j++)     {
                   *(Arr+pos)=mass[j];
                   for(z=0; z<kol; z++)     {        
                   printf("%c",Arr[z]);
                }
                 printf("n");
                 Kol_variantov++;
               }
              }
     else {
          for(i=k; i<36; i++) {
                   *(Arr+pos)=mass[i];
                   pos++;
                   func(n-1, k, mass, Arr, pos, kol);
                   pos--;
    }
  }                         
}


int main () {
    int n, c, j=0, k=0, p=0;
    char v, mass[36]; 
    char * Arr;       
    
    for(v='a'; v<='z'; v++) { 
               mass[j]=v;
               j++;
               }
               
    for(v='0';v<='9'; v++) {
                      mass[j]=v;
                      j++;
                      }
                                 
    printf("Enter amount of symbols in a password: ");
    scanf("%d", &c);
    n=c;
    do {
        Arr=(char *)calloc(c, sizeof(char));
        func(c, k, mass, Arr, p, c);
        c--;
        } while(c>0);
    printf("nnTotal: %d possible passwords or summ(36^n), from n=1 to n=%dnn", Kol_variantov, n);
    getch();
}