Submission #895635

#	Time	Username	Problem	Language	Result	Execution time	Memory
895635		mychecksedad	"The Lyuboyn" code (IZhO19_lyuboyn)	C++17	100 / 100	534 ms	6840 KiB

lyuboyn

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;

int n, k, t, b = 0;
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
void solve(){
  cin >> n >> k >> t;
  for(int i = n-1; i >= 0; --i){
    char c; cin >> c;
    b += (1<<i)*(c=='1');
  }
  vector<int> s, base;

  for(int i = 0; i < (1<<n); ++i) if(__builtin_popcount(i) == k) base.pb(i);

  bool ok = 0;

  int sz = base.size() - 1;

  for(int rep = 0; rep < 200; ++rep){
    vector<bool> used(1<<n);
    s.clear();
    used[0] = 1;
    for(int j = 0; j < n; ++j){
      int mask = 0;
      while(used[mask]){
        mask = base[uniform_int_distribution<int>(0,sz)(rng)];
      }
      s.pb(mask);
      used[mask] = 1;
    }
    ok = 1;
    for(int mask = 1; mask < (1<<n); ++mask){
      int x = 0;
      for(int j = 0; j < n; ++j){
        if((1<<j)&mask){
          x ^= s[j];
        }
      }
      if(x == 0){
        ok = 0;
        break;
      }
    }
    if(ok) break;
  }
  if(!ok){
    cout << -1;
    return;
  }
  // for(int x: s) cout << x << ' ';
  vector<int> cur;
  cur.pb(0);
  for(int i = 0; i < n; ++i){
    vector<int> t;
    for(int j = cur.size() - 1; j >= 0; --j){
      t.pb(cur[j]^s[i]);
    }
    for(int x: t) cur.pb(x);
  }
  cout << (1<<n) << '\n';
  for(int x: cur){
    int num = x^b;
    for(int j = (n-1); j >= 0; --j){
      cout << (((1<<j)&num)>0);
    }
    en;
  }
}



int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  // cin >> tt;
  while(tt--){
    solve();
    // en;
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

Compilation message (stderr)

lyuboyn.cpp: In function 'int main()':
lyuboyn.cpp:83:15: warning: unused variable 'aa' [-Wunused-variable]
   83 |   int tt = 1, aa;
      |               ^~

• Subtask 1: 0 / 0
• Subtask 2: 5 / 5
• Subtask 3: 3 / 3
• Subtask 4: 11 / 11
• Subtask 5: 15 / 15
• Subtask 6: 18 / 18
• Subtask 7: 31 / 31
• Subtask 8: 17 / 17