[LeetCode] 40. Combination Sum II
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注意和39题区别,当前层值相同则跳过
回溯法
void cb2help(vector<vector<int>> &res,vector<int> &v,int target,unsigned int i,vector<int> recp){if(target<0) return;else if(target==0){res.push_back(recp);return;}for(unsigned int k=i;k<v.size();++k){if(k>i&&v[k]==v[k-1]) continue;recp.push_back(v[k]);cb2help(res,v,target-v[k],k+1,recp);recp.pop_back();if(target-v[k]<0) return;}}vector<vector<int>> combinationSum2(vector<int>& v, int target){sort(v.begin(),v.end());vector<vector<int>> res;vector<int> recp;cb2help(res,v,target,0,recp);return res;}
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