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  1. #include<iostream>
  2. using namespace std;
  3.  
  4. void Combination(int numInPair[], int indexInPair, int numArray[],int startOfArray, int endOfArray, int maxCount)
  5. {
  6.     if(endOfArray == 0 || indexInPair == maxCount) // Termination Condition
  7.     {
  8.         for(int i = 0; i< maxCount; i++)  //  Printing Pair's
  9.         {                                 //  Number One By 
  10.             cout << numInPair[i]<<" ";    //  One
  11.         }                                 //
  12.         cout<<"\n";                       //  Next Line
  13.     }
  14.     else
  15.     {
  16.         for(int i = startOfArray; i < endOfArray; i++)
  17.         {
  18.             numInPair[indexInPair] = numArray[i];  
  19.             Combination(numInPair,indexInPair+1,numArray,i+1,endOfArray,maxCount);
  20.             // indexInPair+1 : proceding to next position in pair
  21.             // i+1           : excluding element by incrementing start of array.
  22.             //                 So in next call we iterate for new start to end
  23.         }
  24.  
  25.     }
  26. }
  27.  
  28. void Combination(int * intArray,int arrLength, int pairLength)
  29. {
  30.     int * arrPair = new int[pairLength];
  31.     Combination(arrPair,0,intArray,0,arrLength,pairLength);
  32.     delete[] arrPair;
  33. }
  34.  
  35. int main()
  36. {
  37. 	int arrOfNumbers[] = {1, 2, 3, 4, 5};
  38. 	int length = sizeof(arrOfNumbers)/sizeof(arrOfNumbers[0]);
  39. 	int sizeOfPair = 3;
  40.     Combination(arrOfNumbers,length,sizeOfPair);
  41.     return 0;
  42. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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1 2 3 
1 2 4 
1 2 5 
1 3 4 
1 3 5 
1 4 5 
2 3 4 
2 3 5 
2 4 5 
3 4 5
https://ideone.com/Mv04Oy
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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