Coding-problem-solutions/Common_elements.cpp at master · shalini264/Coding-problem-solutions · GitHub

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class Solution
{
    public:
       vector <int> commonElements (int A[], int B[], int C[], int n1, int n2, int n3)
        {
            vector<int>ans;
            int i=0,j=0,k=0;
            while(i<n1&&j<n2&&k<n3)
            {
                if(A[i]<B[j]&&A[i]<C[k])
                {
                    i++;
                }

                else if(A[i]<=B[j]&&A[i]<C[k])
                {
                    i++;
                }

                else if(A[i]<B[j]&&A[i]<=C[k])
                {
                    i++;
                }
                else if(B[j]<A[i]&&B[j]<C[k])
                {
                    j++;
                }
                else if(B[j]<=A[i]&&B[j]<C[k])
                {
                    j++;
                }
                else if(B[j]<A[i]&&B[j]<=C[k])
                {
                    j++;
                }
                else if(C[k]<A[i]&&C[k]<B[j])
                {
                    k++;
                }
                else if(C[k]<=A[i]&&C[k]<B[j])
                {
                    k++;
                }
                else if(C[k]<A[i]&&C[k]<=B[j])
                {
                    k++;
                }
                else if(A[i]==B[j]&&B[j]==C[k])
                {  ans.push_back(A[i]);
                    i++;
                }


            }
            ans.erase(unique(ans.begin(),ans.end()),ans.end());
            return ans;
        }

};


int main ()
{
    int t; cin >> t;
    while (t--)
    {
        int n1, n2, n3;
        cin >> n1 >> n2 >> n3;
        int A[n1];
        int B[n2];
        int C[n3];

        for (int i = 0; i < n1; i++) cin >> A[i];
        for (int i = 0; i < n2; i++) cin >> B[i];
        for (int i = 0; i < n3; i++) cin >> C[i];

        Solution ob;

        vector <int> res = ob.commonElements (A, B, C, n1, n2, n3);
        if (res.size () == 0)
            cout << -1;
        for (int i = 0; i < res.size (); i++)
            cout << res[i] << " ";
        cout << endl;
    }
}