Submission #1244338

#	Time	Username	Problem	Language	Result	Execution time	Memory
1244338		tamyte	Parrots (IOI11_parrots)	C++17	98 / 100	7 ms	840 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
#include <bits/stdc++.h>
using namespace std;


void dbg(int n) {
  for (int i = 0; i < 8; ++i) {
    cout << (n >> i & 1);
  }
  cout << endl;
}

void encode(int N, int M[])
{
  int index = 0;
  int cnt1 = 0, cnt2 = 0;
  for (int i = 0; i < N; ++i) {
    // dbg(M[i]);
      for (int j = 0; j < 8; j += 2) {
          int now = index++;
          int state = 0;
          for (int k = j; k < j + 2; ++k) {
            state += (1 << (k - j)) * (M[i] >> k & 1);
          }
          cnt1 += state;
          cnt2 += 3 - state;
          // cout << state << "\n";
          for (int k = 0; k < state; ++k) {
            // send(now);
          // dbg(now);

          }


      }
  }
  if (cnt1 <= cnt2) {
    index = 0;
      for (int i = 0; i < N; ++i) {
      // dbg(M[i]);
        for (int j = 0; j < 8; j += 2) {
            int now = index++;
            int state = 0;
            for (int k = j; k < j + 2; ++k) {
              state += (1 << (k - j)) * (M[i] >> k & 1);
            }
            // cnt1 += state;
            // cnt2 += 3 - state;
            // cout << state << "\n";
            for (int k = 0; k < state; ++k) {
              send(now);
            // dbg(now);

            }


        }
    }
  } else {
    index = 0;
    for (int i = 0; i < N; ++i) {
      // dbg(M[i]);
        for (int j = 0; j < 8; j += 2) {
            int now = index++;
            int state = 0;
            for (int k = j; k < j + 2; ++k) {
              state += (1 << (k - j)) * (M[i] >> k & 1);
            }
            // cnt1 += state;
            // cnt2 += 3 - state;
            // cout << state << "\n";
            for (int k = 0; k < 3 - state; ++k) {
              send(now);
            // dbg(now);

            }


        }
    }
    for (int i = 0; i < 4; ++i) {
      send(255);
    }
  }
}

decoder

#include "decoder.h"
#include "decoderlib.h"
#include <bits/stdc++.h>
using namespace std;



void decode(int N, int L, int X[])
{
  // cerr << "HERE!\n";
  vector<int> res(N);
  map<int, int> mp;
  {
    int index = 0;
     for (int i = 0; i < N; ++i) {
      for (int j = 0; j < 8; j += 2) {
        mp[index] = 0;
        index += 1;
      }
    }
  }
 
  for (int i = 0; i < L; ++i) {
    mp[X[i]] += 1;
  }
  // for (auto& [x, c] : mp) {
  //   cerr << x << " " << c << "\n";
  // }
  // cerr << "\n";
  int rev = 0;
  if (mp[255] >= 4) {
    mp[255] -= 4;
    rev = 1;
  }
  // for ()
  int bit = 1, index = 0;
  for (auto& [x, cnt] : mp) {
    // cerr << index << " " << N << "\n";
    if (index >= N) continue;
    res[index] += bit * (rev == 1 ? 3 - cnt : cnt);
    bit <<= 2;
    // cout << index << " " << bit << " " << cnt << "\n";
    if (bit == 256) {
      index += 1;
      bit = 1;
    }
  }
  for (int i = 0; i < N; ++i) {
    output(res[i]);
  }
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 29 / 29
• Subtask 5: 17 / 19