CODEWITHSUNDEEP
c++arraysstlpermutation
Radek Simko
Radek Simko

Reputation: 16126

std::next_permutation() from a part of vector

i'm trying to generate permutations from a part of a vector. See below.

vector<int> myArray;
myArray.resize(5);
myArray[0] = 1;
myArray[1] = 2;
myArray[2] = 3;
myArray[3] = 4;
myArray[4] = 5;
int i = 0;

do {
    for (i = 0; i < myArray.size(); i++) {
        printf("%i ", myArray[i]);
    }
    printf("\n");
} while (next_permutation(myArray.at(1), myArray.at(3)));

I need to generate permutations only between positions 1 and 3. Unfortunately vector::at() is returning reference, but next_permutation() needs BidirectionalIterator as a parameter.

Upvotes: 1

Views: 1244

Answers (1)

Prasoon Saurav
Prasoon Saurav

Reputation: 92864

while (next_permutation(myArray.begin()+1, myArray.begin()+3)); should work

Upvotes: 2

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