Submission #172220

#	Time	Username	Problem	Language	Result	Execution time	Memory
172220		AlexLuchianov	Mechanical Doll (IOI18_doll)	C++14	0 / 100	2 ms	332 KiB

doll

#include "doll.h"
#include <vector>
#include <queue>
#include <algorithm>
#include <iostream>

#define ll long long

int const nmax = 100000;
std::vector<int> v;
std::vector<int> soltriggers;
std::vector<int> sol;

int rev(int n, int number){
  int p = 0;
  while((1 << p) < n)
    p++;
  int result = 0;
  for(int i = 0; i < p; i++)
    if(0 < (number & (1 << i)))
      result |= (1 << (p - 1 - i));
  return result;
}

std::vector<int> left, right;
int devices = 0;

int build(int from, int to){
  if(from < to){
    int mid = (from + to) / 2;
    int lft = build(from, mid), rght = build(mid + 1, to);
    if(lft == -1 && rght == -1)
      return -1;
    else{
      ++devices;
      left.push_back(lft);
      right.push_back(rght);
	  return -devices;
    }
  } else
  return v[from];
}

void create_circuit(int M, std::vector<int> A) {
  int N = A.size();
  std::vector<int> initv;
  for(int i = 0; i < N; i++)
    initv.push_back(A[i]);
  initv.push_back(0);
  soltriggers.resize(1 + M);

  int n = 1;
  while(n < initv.size())
    n *= 2;

  int unused = n - initv.size();
  //std::cout << n << " " << unused << '\n';

  int ptr = 0;
  for(int i = 0; i < n; i++) {
    int pos = rev(n, i);
    if(unused <= pos)
      v[pos] = initv[ptr++];
  }

  for(int i = 0;i <= M; i++)
    soltriggers[i] = -1;
  soltriggers[0] = build(0, n - 1);
}

Compilation message (stderr)

doll.cpp: In function 'void create_circuit(int, std::vector<int>)':
doll.cpp:53:11: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   53 |   while(n < initv.size())
      |         ~~^~~~~~~~~~~~~~

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