Submission #1081627

#	Time	Username	Problem	Language	Result	Execution time	Memory
1081627		kustizus	Library (JOI18_library)	C++17	100 / 100	243 ms	600 KiB

library

// #pragma GCC optimize("O3","unroll-loops")
#include <bits/stdc++.h>
#include "library.h"
using namespace std;

// #define 
// #define int long long
#define all(v) v.begin(), v.end()
#define fi first
#define se second

mt19937_64 rnd(chrono::high_resolution_clock::now().time_since_epoch().count());
// declare

/*int Query(vector <int> m){
    for (int x : m) cout << x << ' ';
    cout << "\n";
    fflush(stdout);
    int ans;
    cin >> ans;
    return ans;
}

void Answer(vector <int> v){
    for (int x : v) cout << x << ' ';
    cout << "\n";
    fflush(stdout);
}*/

void Solve(int n)
{
    if (n <= 2){
        vector <int> ans;
        for (int i = 1; i <= n; ++i) ans.push_back(i);
        Answer(ans);
        return;
    }
    int idx;
    vector <int> m(n, 1);
    for (int i = 1; i <= n; ++i)
    {
        m[i - 1] = 0;
        int ans = Query(m);
        if (ans == 1)
        {
            idx = i;
            break;
        }
        m[i - 1] = 1;
    }
    vector <int> ans = {idx};
    vector <bool> vs(n + 5, false);
    for (int i = 1; i < n; ++i){
        vs[idx] = true;
        vector <int> now;
        for (int j = 1; j <= n; ++j)
            if (!vs[j])
                now.push_back(j);
        int l = 1, r = now.size();
        while (l < r){
            int md = l + r >> 1;
            vector <int> m(n, 0);
            for (int i = l; i <= md; ++i)
                m[now[i - 1] - 1] = 1;
            int c1 = Query(m);
            m[idx - 1] = 1;
            int c2 = Query(m);
            if (c1 == c2) r = md;
            else l = md + 1;
        }
        ans.push_back(now[l - 1]);
        idx = now[l - 1];
    }
    Answer(ans);
}

// 4 2 5 3 1

/*signed main()
{
    // ios_base::sync_with_stdio(false);
    // cin.tie(NULL);
    int t = 1, n;
    // cin >> t;
    cin >> n;
    while (t--) 
        Solve(n);
    cerr << "\nTIME: " << 1000 * clock() / CLOCKS_PER_SEC << "ms.";
}*/

Compilation message (stderr)

library.cpp: In function 'void Solve(int)':
library.cpp:61:24: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
   61 |             int md = l + r >> 1;
      |                      ~~^~~
library.cpp:38:9: warning: 'idx' may be used uninitialized in this function [-Wmaybe-uninitialized]
   38 |     int idx;
      |         ^~~

• Subtask 1: 19 / 19
• Subtask 2: 81 / 81