cp2019_zad9

#include <iostream>
#include <algorithm>

#define print(var) cout << #var << ": " << var<< endl;
#define println(var) cout << var << endl
//#define println(var1, var2) cout << #var1 << "=" << var1 " : " << #var2 << "=" << var2 << endl;

using namespace std;


int main() {
    ios_base::sync_with_stdio(false);

    int tests;
    cin >> tests;

    for (int test = 0; test < tests; test++) {
        int feetCount;
        int shoesCount;
        cin >> feetCount;
        cin >> shoesCount;

        //print(feetCount);
        //print(shoesCount);

        int* feet = new int[feetCount];

        const int lastSize = 50;
        int shoes[lastSize];


        shoes[0] = 0;

        for (int i = 20; i < 50; i++) {
            shoes[i] = 0;
        }

        int skiers = 0;

        for (int i = 0; i < feetCount; i++) {
            cin >> feet[i];
        }

        for (int i = 0; i < shoesCount; i++) {
            int shoeSize;
            cin >> shoeSize;
            shoes[shoeSize]++;
        }

        sort(feet, feet+feetCount);

        for (int i = 0; i < feetCount; i++) {

            int thisSize = feet[i];

            while (feet[i] < lastSize) {
                if (shoes[feet[i]]) {

                    if (thisSize <= feet[i]) {
                        shoes[feet[i]]--;
                        feet[i] = lastSize;
                        skiers++;
                    }
                    else {
                        feet[i] = lastSize;
                    }
                }
                feet[i]++;
            }
        }
        delete[] feet;
        cout << skiers << endl;
    }
}