Comments (1)
可以稍微改进一下拿数字的方法,可以一直push candidate 直到sum 要大于target了。
速度上稍微快一点,stack也可以少用一点。
class Solution {
public:
vector<vector<int>> combinationSum(vector<int>& vn, int target) {
vector<int> vSeq;
helper(0, 0, vn, vSeq, target);
return results_;
}
void helper(int start, int sum, const vector<int>& vn, vector<int>& vSeq, int target){
if(start == vn.size()) return;
for(int i = start; i<vn.size(); ++i){
int size = vSeq.size();
for(int t = sum + vn[i]; t <= target; t += vn[i] ){
vSeq.push_back(vn[i]);
if(t == target) results_.push_back(vSeq);
helper(i+1, t , vn, vSeq, target);
}
vSeq.resize(size);
}
}
vector<vector<int>> results_;
};
from leetcode.
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from leetcode.