Combination Sum II
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Given a collection of candidate numbers (C) and a target number (T), find all unique combinations in C where the candidate numbers sums to T.
Each number in C may only be used once in the combination.
Note:
- All numbers (including target) will be positive integers.
- Elements in a combination (a1, a2, … , ak) must be in non-descending order. (ie, a1 ≤ a2 ≤ … ≤ ak).
- The solution set must not contain duplicate combinations.
For example, given candidate set 10,1,2,7,6,1,5
and target 8
,
A solution set is: [1, 7]
[1, 2, 5]
[2, 6]
[1, 1, 6]
class Solution {public: vector<vector<int> > combinationSum2(vector<int> &num, int target) { sort(num.begin(), num.end()); vector<vector<int> > ret; vector<int> cur; Helper(ret, cur, num, target, 0); return ret; } void Helper(vector<vector<int> > &ret, vector<int> cur, vector<int> &num, int target, int position) { if(target == 0) ret.push_back(cur); else { for(int i = position; i < num.size() && num[i] <= target; i ++) { if(i != position && num[i] == num[i-1]) continue; cur.push_back(num[i]); Helper(ret, cur, num, target-num[i], i+1); cur.pop_back(); } } }};
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