Submission #1009075

#	Time	Username	Problem	Language	Result	Execution time	Memory
1009075		andecaandeci	Commuter Pass (JOI18_commuter_pass)	C++17	0 / 100	2021 ms	6492 KiB

commuter_pass

#include <bits/stdc++.h>
using namespace std;

# define int long long
# define fir first
# define sec second
# define pb push_back
# define endl "\n"

const int cnst = 2e5+5;
bool mutipletestcase = 0;
bool debug = 0;

vector<int> act;

int ask(int x, int idx) {
  cout << "? " << idx << " " << x << endl;
  int a; 
  if(!debug) cin >> a;
  else {
    a = 0;
    for(auto v: act) 
    if(idx <= v && (v+(v^idx)) == x) a = 1;
    else if(idx > v && (v-(v^idx)) == x) a = 1;
  }
  return a;
  // return 1;
}

void solve() {
  int n; cin >> n;

  if(debug) {
    int k; cin >> k;
    for(int i = 1; i<=k; i++) {
      int a; cin >> a;
      act.pb(a);
    }

    // cerr << 50+(50^31) << " " << 50+(50^32) << endl;
  }

  pair<int, int> uniq = {1, 1};
  for(int j1 = 1; j1<=n; j1++) {
    for(int j2 = 1; j2<=n; j2++) {
      map<int, int> mp;
      map<int, int> mp2;
      bool yes = 1;
      for(int k = 1; k<=n; k++) {
        int a;
        int b;

        if(j1 <= k) a = k+(k^j1);
        else a = k-(k^j1);

        if(j2 <= k) b = k+(k^j2);
        else b = k-(k^j2);

        a += 1000;
        b += 1000;

        // cerr << k << " " << a << " " << b << endl;
        mp[a]++;
        mp2[b]++;
      }

      for(int k = 1; k<=n; k++) {
        int a;
        int b;

        if(j1 <= k) a = k+(k^j1);
        else a = k-(k^j1);

        if(j2 <= k) b = k+(k^j2);
        else b = k-(k^j2);

        a += 1000;
        b += 1000;

        // cerr << k << " " << a << " " << b << endl;
        if(mp[a] > 1 && mp2[b] > 1) yes = 0;
      }

      if(yes) {
        cerr << j1 << " " << j2 << endl;
        uniq = {j1, j2};
      }
    }
    }

  // cerr << uniq.fir << " " << uniq.sec << endl;

  vector<int> ans;
    for(int i = 1; i<=n; i++) {
    int a;
    int b;

    if(uniq.fir <= i) a = i+(i^uniq.fir);
    else a = i-(i^uniq.fir);

    if(uniq.sec <= i) b = i+(i^uniq.sec);
    else b = i-(i^uniq.sec);

    // cerr << i << " " << a << " " << b << endl;

    int c = ask(a, uniq.fir);
    int d = ask(b, uniq.sec);

    if(c && d) ans.pb(i);
  }

  cout << "! " << ans.size() << " ";
  for(auto v: ans) cout << v << " "; cout << endl;
}

signed main() {
    // ios_base::sync_with_stdio(false); cin.tie(0);
    int t = 1;
    if(mutipletestcase) cin >> t; 
    while(t--) solve();
}

Compilation message (stderr)

commuter_pass.cpp: In function 'void solve()':
commuter_pass.cpp:113:3: warning: this 'for' clause does not guard... [-Wmisleading-indentation]
  113 |   for(auto v: ans) cout << v << " "; cout << endl;
      |   ^~~
commuter_pass.cpp:113:38: note: ...this statement, but the latter is misleadingly indented as if it were guarded by the 'for'
  113 |   for(auto v: ans) cout << v << " "; cout << endl;
      |                                      ^~~~

• Subtask 1: 0 / 16
• Subtask 2: 0 / 15
• Subtask 3: 0 / 24
• Subtask 4: 0 / 45