String and array manipulations - reverse string, reverse words in a string, find duplicates in an array

Question

Duplicates in Array · Accepted Answer

class Solution {
public:
    vector findDuplicates(vector& nums) {
        vector ans;
        
        int nums_len = nums.size();
        
        unordered_map freq_num;
        unordered_map::iterator itr;
        
        for(int i=0; isecond == 1)
                {
                    ans.push_back(elem);
                }
                itr->second++;
            }
        }
        return ans;
    }
};

Vish · Answer

std::string reverse_string(std::string s){
        int start=0;
        int end=s.length()-1;

        while(start reverse_string_array(std::vector arr){
        int start=0;
        int end=arr.size();

        while(start find_duplicates(std::vector int_arr){
        std::vector res;
        std::unordered_map mp;
        for (int num: int_arr){
            mp[num]+=1;
        }

        for (std::pair p: mp){
            if (p.second>1){
                res.push_back(p.first);
            }
        }
        return res;
    }

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