[LeetCode] 78. Subsets

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void ssHelp(vector<vector<int>> &res,vector<int> &nums,vector<int> &rp,unsigned int cur){res.push_back(rp);for(unsigned int i=cur;i<nums.size();++i){rp.push_back(nums[i]);ssHelp(res,nums,rp,i+1);rp.pop_back();}}vector<vector<int>> subsets(vector<int>& nums){vector<vector<int>> res;vector<int> rp;ssHelp(res,nums,rp,0);return res;}