solution.cpp

#include <bits/stdc++.h>
using namespace std;

class Solution
{
public:
    int kthSmallest(vector<vector<int>> &matrix, int k)
    {
        int n = matrix.size();
        priority_queue<int> q;
        for (int i = 0; i < n; i++)
        {
            for (int j = 0; j < n; j++)
            {
                q.push(matrix[i][j]);
                if (q.size() > k)
                    q.pop();
            }
        }
        return q.top();
    }
};