Two Sum (哈希表)

class Solution {
public:
    vector<int> twoSum(vector<int> &numbers, int target) {
        vector<int > res;
        map<int,int> numMap;
        map<int,int>::iterator iter;
        int len=numbers.size();
        for(int i=0;i<len;i++)
        {
            iter=numMap.find(target-numbers[i]);
            if(iter!=numMap.end())
            {
                res.push_back(iter->second);
                res.push_back(i+1);
                return res;
            }
            else
            {
                numMap[numbers[i]]=i+1;
            }
        }
        
     
    }
};