代码：
1 #include<iostream> 2 #include<vector> 3 4 using namespace std; 5 6 void getResult(vector<vector<int>> &result, vector<int> element, vector<int> nums) 7 { 8 if (element.size() == nums.size()) 9 { 10 result.push_back(element); 11 } 12 else 13 { 14 for (int i = 0; i < nums.size(); i++) 15 { 16 if (find(element.begin(), element.end(), nums[i]) == element.end()) 17 { 18 element.push_back(nums[i]); 19 getResult(result, element, nums); 20 element.pop_back(); 21 } 22 } 23 } 24 } 25 26 vector<vector<int>> permute(vector<int>& nums) 27 { 28 vector<vector<int>> result; 29 vector<int> element; 30 getResult(result, element, nums); 31 return result; 32 } 33 34 int main() 35 { 36 vector<int> nums = {1,2, 3}; 37 vector<vector<int>> result = permute(nums); 38 cout << result.size() << endl; 39 for (int i = 0; i < result.size(); i++) 40 { 41 for (int j = 0; j < result[i].size(); j++) 42 cout << result[i][j] << " "; 43 cout << endl; 44 } 45 }
