Chương trình C ++ để tạo tất cả các kết hợp có thể có từ a, b, c, d, e

Đây là một chương trình C ++ để tạo ra tất cả các kết hợp có thể có từ a, b, c, d, e.

Thuật toán

Begin
   Take the number of elements and the elements as input.
   function Combi(char a[], int reqLen, int s, int currLen, bool check[], int l)
   to print the all possible combination of given array set:
   //
   Here,
   char a[] = character array
   reqLen = required length
   s = start variable
   currLen = current length
   check[] = a boolean variable
   l = length of array
   //
   Body of the Function:
      If currLen>reqLen
         Return
      Else if currLen=reqLen
         Then print the new generated sequence.
      If s = l
         Then return no further element is left.
      For every index there are two option:
      either proceed with a start as ‘true’ and recursively call Combi() with incremented value of ‘currLen’ and ‘s’.
      Or proceed with a start as ‘false’ and recursively call Combi() with only incremented value of ‘s’.
End

Ví dụ

#include<iostream>
using namespace std;
void Combi(char a[], int reqLen, int s, int currLen, bool check[], int l)
{
   if(currLen > reqLen)
   return;
   else if (currLen == reqLen) {
      cout<<"\t";
      for (int i = 0; i < l; i++) {
         if (check[i] == true) {
            cout<<a[i]<<" ";
         }
      }
      cout<<"\n";
      return;
   }
   if (s == l) {
      return;
   }
   check[s] = true;
   Combi(a, reqLen, s + 1, currLen + 1, check, l);
   check[s] = false;
   Combi(a, reqLen, s + 1, currLen, check, l);
}
int main() {
   int i,n;
   bool check[n];
   cout<<"Enter the number of element array have: ";
   cin>>n;
   char a[n];
   cout<<"\n";
   for(i = 0; i < n; i++) {
      cout<<"Enter "<<i+1<<" element: ";
      cin>>a[i];
      check[i] = false;
   }
   for(i = 1; i <= n; i++) {
      cout<<"\nThe all possible combination of length "<<i<<" for the given array set:\n";
      Combi(a, i, 0, 0, check, n);
   }
   return 0;
}

Đầu ra

Enter the number of element array have: 5
Enter 1 element: a
Enter 2 element: b
Enter 3 element: c
Enter 4 element: d
Enter 5 element: e
The all possible combination of length 1 for the given array set:
a
b
c
d
e
The all possible combination of length 2 for the given array set:
a b
a c
a d
a e
b c
b d
b e
c d
c e
d e
The all possible combination of length 3 for the given array set:
a b c
a b d
a b e
a c d
a c e
a d e
b c d
b c e
b d e
c d e
The all possible combination of length 4 for the given array set:
a b c d
a b c e
a b d e
a c d e
b c d e
The all possible combination of length 5 for the given array set:
a b c d e