Submission #1190781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1190781		avighna	Toxic Gene (NOI23_toxic)	C++20	0 / 100	0 ms	320 KiB

toxic

#include "toxic.h"
#include <algorithm>
#include <numeric>
#include <random>
#include <ranges>

void determine_type(int n) {
  std::vector<char> ans(n + 1);

  auto create_vec = [](int s, int e) {
    std::vector<int> ans;
    for (int i = s; i <= e; ++i) {
      ans.push_back(i);
    }
    return ans;
  };

  auto create_sample = [&](std::vector<int>::iterator begin,
                           std::vector<int>::iterator end) {
    std::vector<int> sample;
    for (int bt = 0; bt < 8 and begin != end; ++bt, ++begin) {
      for (int j = 0; j < (1 << bt); ++j) {
        sample.push_back(*begin);
      }
    }
    return sample;
  };

  std::vector<int> naturals(n + 1);
  std::iota(naturals.begin(), naturals.end(), 0);
  std::vector<int> check; // normal, strong
  int toxic_loc = 0;
  for (int i = 1; i <= n; i += 8) {
    auto sample = create_sample(naturals.begin() + i,
                                naturals.begin() + std::min(n + 1, i + 8));
    if (query_sample(sample) == (1 << 8) - 1) {
      for (int j = i; j <= std::min(n, i + 7); ++j) {
        check.push_back(j);
      }
      continue;
    } else {
      std::vector<int> idxs = create_vec(i, std::min(n, i + 7));
      while (true) {
        int pt = *std::ranges::partition_point(
            std::views::iota(0LL, (long long)idxs.size()), [&](int j) {
              std::vector<int> sample;
              for (int k = 0; k <= j; ++k) {
                sample.push_back(idxs[k]);
              }
              return query_sample(sample) == j + 1;
            });
        if (pt == idxs.size()) {
          break;
        }
        ans[idxs[pt]] = 'T';
        toxic_loc = idxs[pt];
        idxs.erase(idxs.begin() + pt);
        std::sort(idxs.begin(), idxs.end());
      }
      for (int i = 0; i < idxs.size(); ++i) {
        check.push_back(idxs[i]);
      }
    }
  }

  std::random_device rd;
  std::mt19937 rng(rd());
  std::shuffle(check.begin(), check.end(), rng);
  for (int i = 0; i < check.size(); i += 8) {
    auto sample = create_sample(
        check.begin() + i, check.begin() + std::min(int(check.size()), i + 8));
    sample.push_back(toxic_loc);
    auto mask = query_sample(sample);
    for (int bt = 0; bt < 8 and i + bt < check.size(); ++bt) {
      if (mask & (1 << bt)) {
        ans[check[i] + bt] = 'S';
      } else {
        ans[check[i] + bt] = 'R';
      }
    }
  }

  for (int i = 1; i <= n; ++i) {
    answer_type(i, ans[i]);
  }
}

• Subtask 1: 0 / 100