46. Permutations, 47. Permutations II
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Given a collection of distinct numbers, return all possible permutations.
For example,
[1,2,3] have the following permutations:
[
[1,2,3],
[1,3,2],
[2,1,3],
[2,3,1],
[3,1,2],
[3,2,1]
]
无重复数据的排列组合:
isVisited 的前后变化很重要
vector<vector<int>> permute(vector<int>& nums) { vector<vector<int>> res; vector<int> tempres; vector<bool> isVisited(nums.size(), false); helper(nums, res, tempres, isVisited); return res;}void helper(vector<int>& nums, vector<vector<int>>& res, vector<int>& tempres, vector<bool>& isVisited) { if (tempres.size() == nums.size()) { res.push_back(tempres); return; } for (int i = 0; i < nums.size(); i++) { if (isVisited[i] == true) continue; tempres.push_back(nums[i]); isVisited[i] = true; helper(nums, res, tempres, isVisited); tempres.pop_back(); isVisited[i] = false; } return;}
- permutation II
Given a collection of numbers that might contain duplicates, return all possible unique permutations.
For example,
[1,1,2] have the following unique permutations:
[
[1,1,2],
[1,2,1],
[2,1,1]
]
有重复数据的排列组合,必须要事前sort一下,然后保证同一个位置上枚举的数不是同一个。
vector<vector<int>> permuteUnique(vector<int>& nums) { sort(nums.begin(), nums.end()); vector<vector<int>> res; vector<int> tempres; vector<bool> isVisited(nums.size(), false); helper(nums, res, tempres, isVisited); return res;}void helper(vector<int>& nums, vector<vector<int>>& res, vector<int>& tempres, vector<bool>& isVisited) { if (tempres.size() == nums.size()) { res.push_back(tempres); return; } int lastnum = nums[0] - 1; for (int i = 0; i < nums.size(); i++) { if (isVisited[i] == true || nums[i] == lastnum) continue; tempres.push_back(nums[i]); isVisited[i] = true; lastnum = nums[i]; helper(nums, res, tempres, isVisited); tempres.pop_back(); isVisited[i] = false; } return;}
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