Submission #75333

#	Time	Username	Problem	Language	Result	Execution time	Memory
75333		Xellos	Mechanical Doll (IOI18_doll)	C++14	70.67 / 100	182 ms	15960 KiB

doll

#include <bits/stdc++.h>
#include "doll.h"
#define ff first
#define ss second
using namespace std;

void create_circuit(int M, vector<int> A) {
  int N = A.size();
  int dep = 1;
  while((1<<dep) < N+1) dep++;
  vector< vector< pair<int, int> > > son[2];
  vector< vector<int> > state(dep);
  son[0].resize(dep);
  son[1].resize(dep);
  for(int i = 0; i < dep; i++) {
    state[i].resize(1<<i, 0);
    son[0][i].resize(1<<i, {i+1, -1});
    son[1][i].resize(1<<i, {i+1, -1});
    for(int j = 0; j < (1<<i); j++) {
      son[0][i][j].ss = 2*j;
      son[1][i][j].ss = 2*j+1;
    }
  }
  vector<int> order;
  for(int i = 0; i < (1<<dep); i++) {
    int cur = 0;
    for(int j = 0; j < dep; j++) {
      int nxt;
      if(state[j][cur]) nxt = son[1][j][cur].ss;
      else nxt = son[0][j][cur].ss;
      state[j][cur] ^= 1;
      cur = nxt;
    }
    order.push_back(cur);
  }
  vector<int> order_used;
  for(int i = 0; i < (1<<dep); i++) if(order[i] < N) order_used.push_back(order[i]);
  order_used.push_back(order.back());
  vector< vector<int> > used(dep);
  for(int i = 0; i < dep; i++) used[i].resize(1<<i, 0);
  for(auto x: order_used) used[dep-1][x/2] = 1;
  for(int i = dep-2; i >= 0; i--) for(int j = 0; j < (1<<i); j++)
    if(used[i+1][2*j] || used[i+1][2*j+1]) used[i][j] = true;
  vector< vector<int> > id(dep);
  int S = 0;
  for(int i = 0; i < dep; i++) {
    id[i].resize(1<<i, -1);
    for(int j = 0; j < (1<<i); j++) if(used[i][j]) id[i][j] = S++;
  }
  vector<int> C(M+1, -1);
  vector<int> X(S, -1), Y(S, -1);
  for(int i = 0; i < dep-1; i++) for(int j = 0; j < (1<<i); j++) if(used[i][j]) {
    if(used[son[0][i][j].ff][son[0][i][j].ss]) X[id[i][j]] = -1-id[son[0][i][j].ff][son[0][i][j].ss];
    if(used[son[1][i][j].ff][son[1][i][j].ss]) Y[id[i][j]] = -1-id[son[1][i][j].ff][son[1][i][j].ss];
  }
  for(int i = 0; i <= N; i++) {
    int nxt = (i < N) ? A[i] : 0;
    int cur = order_used[i]/2;
    if(order_used[i]%2 == 0) X[id[dep-1][cur]] = nxt;
    else Y[id[dep-1][cur]] = nxt;
  }
  answer(C, X, Y);
}

• Subtask 1: 0 / 2
• Subtask 2: 0 / 4
• Subtask 3: 0 / 10
• Subtask 4: 10 / 10
• Subtask 5: 14.7580402392 / 18
• Subtask 6: 45.9139029664 / 56