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Comments

  1. AnonymousNovember 15, 2025 at 5:07 PM

    #include
    using namespace std;

    int main() {
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t;
    cin >> t;
    while (t--) {
    int n, m;
    cin >> n >> m;

    set st; // store chemicals
    for (int i = 0; i < n; i++) {
    long long x;
    cin >> x;
    st.insert(x);
    }

    vector> rules(m);
    for (int i = 0; i < m; i++) {
    cin >> rules[i][0] >> rules[i][1] >> rules[i][2];
    }

    bool changed = true;

    // repeat until no new chemical is added
    while (changed) {
    changed = false;

    for (auto &r : rules) {
    long long x = r[0], y = r[1], z = r[2];

    if (st.count(x) && st.count(y) && !st.count(z)) {
    st.insert(z);
    changed = true; // new chemical added
    }
    }
    }

    cout << st.size() << "\n";
    }

    return 0;
    }

    ReplyDelete

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