Submission #890736

#	Time	Username	Problem	Language	Result	Execution time	Memory
890736		null_awe	Ancient Machine 2 (JOI23_ancient2)	C++17	10 / 100	75 ms	2076 KiB

ancient2

#include <vector>
#include <algorithm>
#include <iostream>
#include "ancient2.h"
using namespace std;

string Solve(int N) {
  string ans = "";
  while ((int) ans.size() < 1) {
    vector<int> c(2);
    for (int i = 0; i < (int) ans.size(); ++i) ++c[ans[i] - '0'];
    int todo = min(c[0], c[1]);
    if (todo > 99) break;
    vector<int> a(todo + 3);
    for (int i = 0; i < todo; ++i) a[i] = i + 1;
    vector<int> b(todo + 3);
    for (int i = 0; i < todo; ++i) b[i] = i;
    a[todo] = a[todo + 1] = todo + 1, a[todo + 2] = todo + 2;
    b[todo] = b[todo + 2] = todo + 2, b[todo + 1] = todo + 1;
    if (c[1] < c[0]) swap(a, b);
    int x = Query(todo + 3, a, b);
    if (x == a[todo]) ans += "0";
    else ans += "1";
  }
  if ((int) ans.size() == N) return ans;
  while ((int) ans.size() < N) {
    vector<int> c(2);
    for (int i = 0; i < (int) ans.size(); ++i) ++c[ans[i] - '0'];
    int todo = c[ans.back() - '0'];
    if (todo > 0 && todo < 10000) {
      vector<int> a(todo + 3);
      for (int i = 0; i < todo; ++i) a[i] = i + 1;
      vector<int> b(todo + 3);
      for (int i = 0; i < todo; ++i) b[i] = i;
      a[todo] = a[todo + 1] = todo + 1, a[todo + 2] = todo + 2;
      b[todo] = b[todo + 2] = todo + 2, b[todo + 1] = todo + 1;
      if (ans.back() == '1') swap(a, b);
      int x = Query(todo + 3, a, b);
      if (x == a[todo]) ans += "0";
      else ans += "1";
      continue;
    }

    vector<int> a(102, -1);
    vector<int> b(102, -1);
    a[100] = b[100] = 100;
    a[101] = b[101] = 101;
    for (int i = 0; i < 98; ++i) a[i] = i + 1, b[i] = i + 1;
    a[98] = 3, b[98] = 7;
    int idx = 0;
    for (int i = 0; i < (int) ans.size(); ++i) {
      ++idx;
      if (idx > 98) {
        if (ans[i] == '0') idx = a[98];
        else idx = b[98];
      }
    }
    if (ans.back() == '1') {
      a[99] = idx;
      a[idx - 1] = 99;
      if (idx == a[98]) a[98] = 99;
      a[idx] = 100;
    } else {
      b[99] = idx;
      b[idx - 1] = 99;
      if (idx == b[98]) b[98] = 99;
      b[idx] = 100;
    }
    for (int i = 0; i < 102; ++i) {
      if (a[i] < 0) a[i] = 101;
      if (b[i] < 0) b[i] = 101;
    }
    int x = Query(102, a, b);
    if (x != 100) ans += string(1, ans.back());
    else ans += string(1, (char) ('0' + '1' - ans.back()));
    // cout << "has " << ans << '\n';
  }
  return ans;
}

• Subtask 1: 10 / 100