378. Kth Smallest Element in a Sorted Matrix.cpp

class Solution
{
public:
    int kthSmallest(vector<vector<int>> &matrix, int k)
    {
        int n = matrix.size();
        vector<int> v1;
        for (int i = 0; i < n; i++)
            for (int j = 0; j < n; j++)
                v1.push_back(matrix[i][j]);
        sort(v1.begin(), v1.end());
        return v1[k - 1];
    }
};