Submission #1056427

#	Time	Username	Problem	Language	Result	Execution time	Memory
1056427		juicy	Ancient Machine (JOI21_ancient_machine)	C++17	0 / 100	4 ms	2004 KiB

Anna

#include "Anna.h"

#include <bits/stdc++.h>

using namespace std;

namespace {

}

void Anna(int N, std::vector<char> S) {
  int B = 63, K = 44;
  vector<long long> fib(B);
  fib[0] = fib[1] = 1;
  for (int i = 2; i < B; ++i) {
    fib[i] = fib[i - 1] + fib[i - 2];
  }
  auto encode = [&](vector<int> msg) {
    long long res = 0;
    for (int i = 0; i < B; ++i) {
      res += msg[i] * fib[i];
    }
    return res;
  };
  int p = 0;
  vector<int> msg;
  while (p < N && S[p] != 'X') {
    ++p;
    msg.push_back(0);
  }
  if (p < N) {
    msg.push_back(1);
    msg.push_back(0);
    ++p;
  }
  for (; p < N; ++p) {
    if (S[p] == 'Z' && (p + 1 == N || S[p + 1] != S[p])) {
      msg.push_back(1);
    } else {
      msg.push_back(0);
    }
  }
  while (msg.size() % B) {
    msg.push_back(0);
  }
  for (int i = 0; i < msg.size(); i += B) {
    auto x = encode(vector(msg.begin() + i, msg.begin() + B));
    for (int j = 0; j < K; ++j) {
      Send(x >> j & 1);
    }
  }
}

Bruno

#include "Bruno.h"

#include <bits/stdc++.h>

using namespace std;

namespace {

}

void Bruno(int N, int L, std::vector<int> A) {
  int B = 63, K = 44;
  vector<long long> fib(B);
  fib[0] = fib[1] = 1;
  for (int i = 2; i < B; ++i) {
    fib[i] = fib[i - 1] + fib[i - 2];
  }
  auto decode = [&](long long x) {
    string msg;
    for (int i = B - 1; i >= 0; --i) {
      if (x >= fib[i]) {
        msg += '1';
        x -= fib[i];
      } else {
        msg += '0';
      }
    }
    reverse(msg.begin(), msg.end());
    return msg;
  };
  string S;
  for (int i = 0; i < L; i += B) {
    long long x = 0;
    for (int j = 0; j < B; ++j) {
      x += A[i + j] << j;
    }
    S += decode(x);
  } 
  int p = 0;
  while (p < N && S[p] == '0') {
    Remove(p++);
  }
  if (p == N) {
    return;
  }
  int i = p + 2, lst = i;
  for (; i <= N; ++i) {
    if (S[i] == '1') {
      for (int j = i - 1; j >= lst; --j) {
        Remove(j - 1);
      }
      Remove(i - 1);
      lst = i + 1;
    }
  }
  for (i = N; i >= lst; --i) {
    Remove(i - 1);
  }
  Remove(p);
}

Compilation message (stderr)

Anna.cpp: In function 'void Anna(int, std::vector<char>)':
Anna.cpp:46:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   46 |   for (int i = 0; i < msg.size(); i += B) {
      |                   ~~^~~~~~~~~~~~

Bruno.cpp: In function 'void Bruno(int, int, std::vector<int>)':
Bruno.cpp:12:15: warning: unused variable 'K' [-Wunused-variable]
   12 |   int B = 63, K = 44;
      |               ^

• Subtask 1: 0 / 5
• Subtask 2: 0 / 95