#include <vector>
#include <unordered_map>
#include <algorithm>

using namespace std;

class Solution {
public:
    int cardboards(vector<int>& arr) {
        unordered_map<int, int> count;
        for (int num : arr) {
            count[num]++;
        }

        int squares = 0;
        for (auto& pair : count) {
            squares += pair.second / 4;
            pair.second %= 4;
        }

        int rectangles = 0;
        int pairs = 0;
        for (auto& pair : count) {
            pairs += pair.second / 2;
        }
        rectangles = pairs / 2;

        return abs(squares - rectangles);
    }
};

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def solve(N, D, P, S):
    ants = sorted(zip(P, S))
    colonies = 0
    slowest_time = float('-inf')
@Mrtrueliving_ix 
    for pos, speed in reversed(ants):
        time_to_reach = (D - pos) / speed
        if time_to_reach > slowest_time:
            colonies += 1
            slowest_time = time_to_reach
@Mrtrueliving_ix 
    return colonies