Submission #646530

#	Time	Username	Problem	Language	Result	Execution time	Memory
646530		Do_you_copy	Carnival (CEOI14_carnival)	C++17	100 / 100	26 ms	316 KiB

carnival

#include <bits/stdc++.h>
//#define int long long
#define pb push_back
#define fi first
#define se second
#define faster ios_base::sync_with_stdio(0); cin.tie(0);

using namespace std;
using ll = long long;
using pii = pair <int, int>;
mt19937_64 Rand(chrono::steady_clock::now().time_since_epoch().count());

inline ll max(const ll &a, const ll &b){
    return (a > b) ? a : b;
}

inline ll min(const ll &a, const ll &b){
    return (a < b) ? a : b;
}

const int maxN = 1e5 + 1;
//const int Mod = 1e9 + 7;
//const int inf =
int n;

struct TDSU{
    vector <int> lab;
    vector <pii> save;
    TDSU(int _n){
        lab.resize(_n, -1);
    }
    inline void resize(int _n){
        lab.resize(_n, -1);
    }
    inline int find_set(int u){
        return lab[u] < 0 ? u : lab[u] = find_set(lab[u]);
    }
    inline int find(int u){
        return lab[u] < 0 ? u : find(lab[u]);
    }
    inline void merge(int u, int v){
        if (lab[u] > lab[v]) swap(u, v);
        lab[u] += lab[v];
        save.pb({v, lab[v]});
        lab[v] = u;
    }
    inline void undo(){
        int v = save.back().fi;
        int u = lab[v];
        lab[v] = save.back().se;
        lab[u] -= lab[v];
        save.pop_back();
    }
    inline void roll_back(int _n){
        while (save.size() > size_t(n)){
            undo();
        }
    }
};

int check(int i, int j, int k = 0){
    cout << j - i + 1 + bool(k) << " ";
    for (int it = i; it <= j; ++it){
        cout << it << " ";
    }
    if (k) cout << k << " ";
    cout << endl;
    int x; cin >> x;
    return x;
}

int id[maxN], cnt;

void Init(){
    cin >> n;
    TDSU dsu(n + 1);
    for (int i = 2; i <= n; ++i){
        if (check(1, i - 1, 0) != check(1, i - 1, i)) continue;
        int l = 1, r = i - 1;
        while (l < r){
            int mid = (l + r) >> 1;
            if (check(1, mid, 0) != check(1, mid, i)) l = mid + 1;
            else r = mid;
        }
        int x = dsu.find_set(l);
        dsu.merge(x, i);
    }
    cout << 0 << " ";
    for (int i = 1; i <= n; ++i){
        int j = dsu.find_set(i);
        if (!id[j]) id[j] = ++cnt;
        id[i] = id[j];
        cout << id[i] << " ";
    }
    cout << endl;
    exit(0);
}


#define debug
#define taskname ""
signed main(){
    if (fopen(taskname".inp", "r")){
        freopen(taskname".inp", "r", stdin);
        freopen(taskname".out", "w", stdout);
    }
    int tt = 1;
    //cin >> tt;
    while (tt--){
        Init();
    }
    if (fopen("timeout.txt", "r")){
        ofstream timeout("timeout.txt");
        timeout << signed(double(clock()) / CLOCKS_PER_SEC * 1000);
        timeout.close();
        #ifndef debug
        cerr << "\nTime elapsed: " << signed(double(clock()) / CLOCKS_PER_SEC * 1000) << "ms\n";
        #endif // debug
    }
}

Compilation message (stderr)

carnival.cpp: In function 'int main()':
carnival.cpp:104:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  104 |         freopen(taskname".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~
carnival.cpp:105:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
  105 |         freopen(taskname".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 20 / 20
• Subtask 3: 20 / 20
• Subtask 4: 20 / 20
• Subtask 5: 20 / 20