32 lines
779 B
C++
32 lines
779 B
C++
#include "s0046_permutations.hpp"
|
|
|
|
void permuteDFS(vector<int> &path, vector<vector<int>> &result,
|
|
vector<bool> &used, vector<int> &nums) {
|
|
int len = nums.size();
|
|
// 终止条件
|
|
if (path.size() == len) {
|
|
result.push_back(path);
|
|
return;
|
|
}
|
|
|
|
// 开始迭代
|
|
for (int i{0}; i < len; ++i) {
|
|
// 如果当前元素使用过，则跳过
|
|
if (used[i]) continue;
|
|
// 否则处理当前节点
|
|
path.push_back(nums[i]);
|
|
used[i] = true;
|
|
permuteDFS(path, result, used, nums);
|
|
used[i] = false;
|
|
path.pop_back();
|
|
}
|
|
}
|
|
|
|
vector<vector<int>> S0046::permute(vector<int> &nums) {
|
|
vector<int> path{};
|
|
vector<vector<int>> result{};
|
|
vector<bool> used(nums.size(), false);
|
|
permuteDFS(path, result, used, nums);
|
|
return result;
|
|
}
|