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Link for the Problem – Combination Sum II– LeetCode Problem
Combination Sum II– LeetCode Problem
Problem:
Given a collection of candidate numbers (candidates
) and a target number (target
), find all unique combinations in candidates
where the candidate numbers sum to target
.
Each number in candidates
may only be used once in the combination.
Note: The solution set must not contain duplicate combinations.
Example 1:
Input: candidates = [10,1,2,7,6,1,5], target = 8 Output: [ [1,1,6], [1,2,5], [1,7], [2,6] ]
Example 2:
Input: candidates = [2,5,2,1,2], target = 5 Output: [ [1,2,2], [5] ]
Constraints:
1 <= candidates.length <= 100
1 <= candidates[i] <= 50
1 <= target <= 30
Combination Sum II– LeetCode Solutions
class Solution { public: vector<vector<int>> combinationSum2(vector<int>& candidates, int target) { vector<vector<int>> ans; sort(begin(candidates), end(candidates)); dfs(candidates, 0, target, {}, ans); return ans; } private: void dfs(const vector<int>& A, int s, int target, vector<int>&& path, vector<vector<int>>& ans) { if (target < 0) return; if (target == 0) { ans.push_back(path); return; } for (int i = s; i < A.size(); ++i) { if (i > s && A[i] == A[i - 1]) continue; path.push_back(A[i]); dfs(A, i + 1, target - A[i], move(path), ans); path.pop_back(); } } };
class Solution { public List<List<Integer>> combinationSum2(int[] candidates, int target) { List<List<Integer>> ans = new ArrayList<>(); Arrays.sort(candidates); dfs(0, candidates, target, new ArrayList<>(), ans); return ans; } private void dfs(int s, int[] candidates, int target, List<Integer> path, List<List<Integer>> ans) { if (target < 0) return; if (target == 0) { ans.add(new ArrayList<>(path)); return; } for (int i = s; i < candidates.length; ++i) { if (i > s && candidates[i] == candidates[i - 1]) continue; path.add(candidates[i]); dfs(i + 1, candidates, target - candidates[i], path, ans); path.remove(path.size() - 1); } } }
class Solution: def combinationSum2(self, candidates: List[int], target: int) -> List[List[int]]: ans = [] def dfs(s: int, target: int, path: List[int]) -> None: if target < 0: return if target == 0: ans.append(path) return for i in range(s, len(candidates)): if i > s and candidates[i] == candidates[i - 1]: continue dfs(i + 1, target - candidates[i], path + [candidates[i]]) candidates.sort() dfs(0, target, []) return ans
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