next permutation II

next_perm2.cc

#include <algorithm>
#include <vector>
using namespace std ;
int int_cmp(int i, int j){ return (i<j) ;}
class Solution {
public:
 
  vector<vector<int> > permuteUnique(vector<int> &num) {
  sort(num.begin(), num.end(), int_cmp ) ; 
  vector<vector<int> > ret;
  do{
  ret.push_back( num );
  }while(next_permutation(num.begin(), num.end())!=false);
  return ret;
  }
};