Leetcode 39. Combination Sum (Medium) (cpp)
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Leetcode 39. Combination Sum (Medium) (cpp)
Tag: Array, Backtracking
Difficulty: Medium
/*39. Combination Sum (Medium)Given a set of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.The same repeated number may be chosen from C unlimited number of times.Note:All numbers (including target) will be positive integers.The solution set must not contain duplicate combinations.For example, given candidate set [2, 3, 6, 7] and target 7, A solution set is: [ [7], [2, 2, 3]]*/class Solution {public: vector<vector<int>> combinationSum(vector<int>& candidates, int target) { vector<vector<int>> res; vector<int> res_sub; sort(candidates.begin(), candidates.end()); combinationSum(candidates, target, 0, res_sub, res); return res; }private: void combinationSum(vector<int>& candidates, int target, int start, vector<int>& res_sub, vector<vector<int>>& res) { if (target < 0 || start > candidates.size()) { return; } else if (target == 0) { res.push_back(res_sub); return; } for (int i = start; i < candidates.size() && candidates[i] <= target; i++) { res_sub.push_back(candidates[i]); combinationSum(candidates, target - candidates[i], i, res_sub, res); res_sub.pop_back(); } }};
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