90. Subsets II
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class Solution {public: vector<vector<int>> ans; vector<int> s; vector<vector<int>> subsetsWithDup(vector<int>& nums) { sort(nums.begin(), nums.end()); dfs(nums, 0); return ans; } void dfs(const vector<int> &nums, int pos){ if(pos >= nums.size()){ ans.push_back(s); return; } s.push_back(nums[pos]); dfs(nums, ++pos); s.pop_back(); while(pos < nums.size() && nums[pos] == nums[pos-1]) ++pos; dfs(nums, pos); }};
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