diff options
Diffstat (limited to 'other/permutations.cpp')
-rw-r--r-- | other/permutations.cpp | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/other/permutations.cpp b/other/permutations.cpp new file mode 100644 index 0000000..2e86fc0 --- /dev/null +++ b/other/permutations.cpp @@ -0,0 +1,26 @@ +#include "leetcode.h" + +class Solution { +public: + vector<vector<int>> permute(vector<int> &nums) { + vector<vector<int>> ans; + int idx = 0; + helper(nums, ans, idx); + return ans; + } + +private: + void helper(vector<int> &nums, vector<vector<int>> &ans, int idx) { + if (idx >= nums.size()) { + ans.push_back(nums); + return; + } + for (int i = idx; i < nums.size(); i++) { + swap(nums[idx], nums[i]); + helper(nums, ans, idx + 1); + swap(nums[idx], nums[i]); + } + } +}; + +int main() {} |