vectordemos

#include <iostream>
#include <queue>

using namespace std;

#define print(var) cout << #var << ": " << var << endl;

int main() {
    unsigned int tests;
    cin >> tests;

    for (unsigned int test = 0; test < tests; test++) {

        int readRows, citiesCount, K;
        cin >> citiesCount >> readRows;

        citiesCount;
        print(citiesCount);
        print(readRows)

        vector<vector<int>> cities;

        for (int city = 0; city < citiesCount; city++) {
            vector<int> v = {};
            cities.push_back(v);
        }

        for (int rows = 0; rows < readRows; rows++) {
            int start, end;
            cin >> start >> end;
            print(start);
            print(end);
            cities[start - 1].push_back(end-1);
            cities[end - 1].push_back(start - 1);
        }
        cin >> K;
        for (int city = 0; city < citiesCount; city++) {
            cout << city+1 << " => " << cities[city].size() << endl;
        }

    }
}