Submission #538634

#	Time	Username	Problem	Language	Result	Execution time	Memory
538634		cig32	"The Lyuboyn" code (IZhO19_lyuboyn)	C++17	100 / 100	153 ms	9080 KiB

lyuboyn

#include "bits/stdc++.h"
using namespace std;
const int MAXN = 2e5 + 10;
const int MOD = 1e9 + 7;
#define int long long
#define ll __int128
mt19937_64 rng((int)std::chrono::steady_clock::now().time_since_epoch().count());
int rnd(int x, int y) {
  int u = uniform_int_distribution<int>(x, y)(rng); return u;
}
ll read() { // read int128
  int x; cin >> x; return (ll)x;
}
long long bm(long long b, long long p) {
  if(p==0) return 1 % MOD;
  long long r = bm(b, p >> 1);
  if(p&1) return (((r*r) % MOD) * b) % MOD;
  return (r*r) % MOD;
}
long long inv(long long b) { 
  return bm(b, MOD-2);
}
long long f[MAXN];
long long nCr(int n, int r) { 
  long long ans = f[n]; ans *= inv(f[r]); ans %= MOD;
  ans *= inv(f[n-r]); ans %= MOD; return ans;
}
void precomp() { 
  for(int i=0; i<MAXN; i++) f[i] = (i == 0 ? 1 % MOD : (f[i-1] * i) % MOD);
}
void solve(int tc) {
  int n, k, t;
  cin >> n >> k >> t;
  string s;
  cin >> s;
  vector<int> ans;
  int xorsum = 0;
  ans.push_back(0);
  vector<int> tog;
  int cur = (1<<k) - 1;
  for(int i=1; i<=n; i++) {
    tog.push_back(cur);
    if(cur >= (1 << (n-1))) {
      cur -= (1 << (n-1));
      cur <<= 1;
      if(n % k == 0 && k > 1) cur += 2;
      else cur += 1;
    }
    else {
      cur <<= 1;
    }
  }
  for(int i=1; i<(1<<n); i++) {
    xorsum ^= tog[(int)log2(i & -i)];
    ans.push_back(xorsum);
    //cout << tog[(int)log2(i & -i)] << ' ';
    //if(i % 8 == 0) cout << '\n';
  }
  /*
  cout << '\n';
  cout << "tog[]: ";
  for(int i=0; i<n; i++) cout << tog[i] << ' ';
  cout << '\n';
  freopen("uwu.txt", "w", stdout);
  */
  if(k % 2 == 0) {
    cout << "-1\n";
    return;
  }
  cout << (1<<n) << '\n';
  int pos;
  int val = 0;
  for(int i=0; i<s.size(); i++) {
    val *= 2;
    val += (s[i] == '1');
  }
  for(int i=0; i<ans.size(); i++) {
    if(ans[i] == val) pos = i;
  }
  for(int i=pos; i<pos+ans.size(); i++) {
    for(int j=n-1; j>=0; j--) {
      if(ans[i % (1<<n)] & (1<<j)) cout << "1";
      else cout << "0";
    }
    cout << '\n';
  }
}
int32_t main(){
  precomp();
  ios::sync_with_stdio(0); cin.tie(0);
  int t = 1; //cin >> t;
  for(int i=1; i<=t; i++) solve(i);
} 
/*

7 28 7 14 7 56 7 14 7 28 7 14 7 49 
6 3 0 000000

n = 6, k = 3
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 49 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 35 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 49 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 
tog[]: 7 14 28 56 49 35 

n = 7, k = 3
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 112 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 97 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 112 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 67 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 112 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 97 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 112 
7 14 7 28 7 14 7 56 
7 14 7 28 7 14 7 
tog[]: 7 14 28 56 112 97 67 


0
7
12
11
6
1
10
13
3
4
15
8
5
2
9
14

7
12
1
15
8
3
14
0
7
12
1
15
8
3
14

7  (0111)
13 (1101)
11 (1011)
7  (0111)
14 (1110)
13 (1101)
14 (1110)
7  (0111)
14 (1110)
13 (1101)
11 (1011)
13 (1101)
7  (0111)
13 (1101)
14 (1110)
*/

Compilation message (stderr)

lyuboyn.cpp: In function 'void solve(long long int)':
lyuboyn.cpp:73:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   73 |   for(int i=0; i<s.size(); i++) {
      |                ~^~~~~~~~~
lyuboyn.cpp:77:17: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   77 |   for(int i=0; i<ans.size(); i++) {
      |                ~^~~~~~~~~~~
lyuboyn.cpp:80:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'long long unsigned int' [-Wsign-compare]
   80 |   for(int i=pos; i<pos+ans.size(); i++) {
      |                  ~^~~~~~~~~~~~~~~
lyuboyn.cpp:80:20: warning: 'pos' may be used uninitialized in this function [-Wmaybe-uninitialized]
   80 |   for(int i=pos; i<pos+ans.size(); i++) {
      |                    ^~~

• 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