Submission #274109

#	Time	Username	Problem	Language	Result	Execution time	Memory
274109		toonewbie	Carnival (CEOI14_carnival)	C++17	100 / 100	11 ms	384 KiB

carnival

#pragma GCC optimize("Ofast")
#include <bits/stdc++.h>

#define F first
#define S second
#define pb push_back
//#define endl '\n'
#define ll long long
#define pi pair<int,int>

using namespace std;

const int MOD = 1e9 + 7;
const int N = 155;

int n, res[N];
int ask(vector<int> v) {
    cout << v.size() << " ";
    for (int i : v) cout << i << " ";
    cout << endl;
    int x; cin >> x;
    return x;
}

int main() {
    ios_base :: sync_with_stdio(0);
    cin.tie(0);
    cin >> n;
    vector<int> v = {1};
    int say = 1; res[1] = 1;
    for (int i = 2; i <= n; i++) {
        v.pb(i);
        if (ask(v) == say + 1) {
            say++;
            res[i] = say;
        } else v.pop_back();
    }
    for (int i = 1; i <= n; i++) {
        if (res[i] == 0) {
            int l = 0, r = (int)v.size() - 1, id;
            while(r - l >= 0) {
                int mid = (l + r) >> 1;
                vector<int> tmp = {i};
                for (int i = 0; i <= mid; i++) tmp.pb(v[i]);
                /// mid + 1
                if (ask(tmp) == mid + 1) {
                    id = mid;
                    r = mid - 1;
                } else l = mid + 1;
            }
            res[i] = res[v[id]];
        }
    }
    cout << 0 << " ";
    for (int i = 1; i <= n; i++) {
        cout << res[i] << " ";
    }
    cout << endl;
    return 0;
}

Compilation message (stderr)

carnival.cpp: In function 'int main()':
carnival.cpp:51:30: warning: 'id' may be used uninitialized in this function [-Wmaybe-uninitialized]
   51 |             res[i] = res[v[id]];
      |                              ^

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