Submission #1239159

#	Time	Username	Problem	Language	Result	Execution time	Memory
1239159		dosts	Mechanical Doll (IOI18_doll)	C++20	0 / 100	1 ms	2632 KiB

doll

#include "bits/stdc++.h"
#include "doll.h"

using namespace std;

void create_circuit(int M, vector<int> A)
{
  int N = A.size();
  vector<int> C(M + 1);
  C[0] = A[0];
  vector<int> X, Y;
  vector<int> move(6e5);
  vector<vector<int>> g(M + 1);
  for (int i = 0; i < N; i++)
    g[0].push_back(A[i]);
  g[A.back()].push_back(0);
  for (int i = 0; i <= M; i++)
  {
    int sz = g[i].size();
    if (sz == 0)
      continue;
    if (sz == 1)
    {
      C[i] = g[i][0];
      continue;
    }
    int x = 0;
    while ((1ll << x) < sz)
      x++;
    int ind = X.size() + 1;
    ind *= -1;
    C[i] = ind;
    int r = 0;
    reverse(g[i].begin(), g[i].end());
    while (sz < (1ll << x))
      sz++, g[i].push_back(ind), r++;
    reverse(g[i].begin(), g[i].end());
    auto build = [&](auto build, int L, int R) -> void
    {
      if (L == R - 1)
      {
        X.push_back(1e9), Y.push_back(1e9);
        if (L < r)
          X.back() = ind;
        if (R < r)
          Y.back() = ind;
      }
      else
      {
        int a = X.size() + 1;
        X.push_back(ind);
        Y.push_back(-a - 1);
        int m = (L + R) / 2;
        build(build, m + 1, R);
        if (m < r)
          return;
        X[a - 1] = -(X.size() + 1);
        build(build, L, m);
      }
    };
    build(build, 0, sz - 1);
    for (int x = r; x < sz; x++)
    {
      int pv = -1;
      int cur = -ind;
      while (abs(cur) != 1e9)
        pv = cur, cur = -((move[cur]++) % 2 ? Y[cur - 1] : X[cur - 1]);
      if (move[pv] % 2)
        X[pv - 1] = g[i][x];
      else
        Y[pv - 1] = g[i][x];
    }
  }
  answer(C, X, Y);
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 0 / 10
• Subtask 5: 0 / 18
• Subtask 6: 0 / 56