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-rw-r--r--other/permutations.cpp26
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() {}