permutation code

[donfire]

can someone modify this code to do general permutations? what I mean by general permutation is that I should be able to do 5p0 or 5p5 or 5p3...the source codes google helped me to find where all doing "all permutations"...

this is a code to do general combinations using backtracking, hopefully someone can modify it to do general permutations

void combinationUtil(int arr[], int store[], int start, int end, int stInd, int r) 
{    // Current combination is ready to be printed, print it 
 
    if (stInd == r) 
    { 
        for (int j=0; j<r; j++) 
        { 
         printf("%d ", store[j]); 
        } 
        
        printf("  \n"); 
    } 
    // replace index with all possible elements. The condition 
    // "end-i+1 >= r-index" makes sure that including one element 
    // at index will make a combination with remaining elements 
    // at remaining positions 
    else 
    { 
      for (int str=start; str <= end && end-str+1 >= r-stInd; str++) 
      { 
        store[stInd] = arr[str]; 
        combinationUtil(arr, store, str+1, end, stInd+1, r); 
      } 
    } 
}

[stahta01]

https://cboard.cprogramming.com/c-pr...uncements.html

[rstanley]

can someone modify this code to do general permutations?

You need to make the first attempt at making the changes you want. We then can look at your code and make suggestions.

We cannot and do not write the code for you.

[donfire]

You need to make the first attempt at making the changes you want. We then can look at your code and make suggestions.

We cannot and do not write the code for you.

I have tried and tried for a week now and I couldn't make the code do the permutations correctly, starting by using the combination code I posted...I have edited my attempts which didn't work soo much, out of frustrations I deleted it all, if you wanna help help...I need this to insert into a bigger program I'm writing...

[rstanley]

Rather then deleting your attempt at the permutation code, you should post it here in Code Tags so we can see where you went wrong.

Please post your attempted function, along with a small main(), that creates a test program, that someone here can compile and test.

Otherwise, we cannot hep you.