#ifndef PERMUTATION_H
#define PERMUTATION_H

class permutation {
  public:
    permutation(int size); // initialize to identity
    void transpose(int i, int j);
    void random();
    int operator[](int i); // return the image of i (i and its image 0-based)
  protected:
    int *sigma, size; // data[i] is the image of i
};

#endif // PERMUTATION_H