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Submission #304330

# Submission time Handle Problem Language Result Execution time Memory
304330 2020-09-21T06:23:51 Z Fdg Counting Mushrooms (IOI20_mushrooms) C++14
97.4138 / 100
 14 ms 640 KB 
#include <iostream>
#include <vector>
#include <map>
#include <set>
#include <algorithm>
#include "mushrooms.h"

using namespace std;

const int VAL = 110;

vector<int> a, b, missing;

map<int, vector<int>> diff, eq;
set<int> found;

void nextPos(const vector<int>& v, int& pos) {
  while (pos < (int) v.size()) {
    if (found.count(v[pos])) {
      ++pos;
    } else break;
  }
}

void process(int x, bool isA) {
  if (found.count(x)) return;
  found.insert(x);

  if (isA) a.push_back(x);
  else b.push_back(x);

  if (diff.count(x))
    for (int val : diff[x]) {
      process(val, !isA);
    }

  if (eq.count(x))
    for (int val : eq[x]) {
      process(val, isA);
    }
}

int count_mushrooms(int n) {
  a.clear(); b.clear(); diff.clear(); found.clear(); missing.clear();

  srand(time(NULL));
  vector<int> v;
  // for (int i = 0; i < n; ++i)
  //   v.push_back(i);
  // for (int it = 0; it < 1; ++it) {
  //   random_shuffle(v.begin(), v.end());
  //   use_machine(v);
  // }

  v.clear();
  for (int i = 1; i < n; ++i)
    v.push_back(i);
  random_shuffle(v.begin(), v.end());

  /*v.push_back(0);
  use_machine(v);
  v.pop_back();*/

  int ans = 0, pos = 0;

  bool doNextSimple = false;

  double COEF = 1.2;
  int iter = 1;

  a.push_back(0); found.insert(0);
  while (a.size() < VAL && b.size() < VAL && pos < (int) v.size()) {
    // if (a.size() > 100 && a.size() > COEF * b.size()) break;
    // if (b.size() > 100 && b.size() > COEF * a.size()) break;

    if ((n - a.size() - b.size()) / max(a.size(), b.size()) + iter <= 228) break;
    ++iter;
    // if (iter >= VAL) break;

    /*if (a.size() > 1) {
      vector<int> arr;
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(v[pos]), ++pos;
        arr.push_back(a[0]);
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(v[pos]), ++pos;
        arr.push_back(a[1]); 
      }
      // if (!doNextSimple) {
      //   nextPos(v, pos);
      //   if (pos < (int) v.size()) arr.push_back(v[pos]), ++pos;
      // }
 
      doNextSimple = false;
      int ret = use_machine(arr);
      if (arr.size() == 2) {
        if (ret == 1) {
          process(arr[0], false);
        } else {
          process(arr[0], true);
        }
      } else if (arr.size() == 4) {
        if (ret == 3) {
          process(arr[0], false);
          process(arr[2], false);
        } else if (ret == 2) {
          process(arr[0], true);
          process(arr[2], false);
        } else if (ret == 1) {
          process(arr[0], false);
          process(arr[2], true); 
        } else {
          process(arr[0], true);
          process(arr[2], true);
        }
      } else if (arr.size() == 5) {
        if (ret == 4) {
          process(arr[0], false);
          process(arr[2], false);
          process(arr[4], false);
        } else if (ret == 3) {
          process(arr[2], false);
          diff[arr[0]].push_back(arr[4]);
          diff[arr[4]].push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[0];
          doNextSimple = true;
        } else if (ret == 2) {
          diff[arr[0]].push_back(arr[2]);
          diff[arr[2]].push_back(arr[0]);
          diff[arr[4]].push_back(arr[2]);
          diff[arr[2]].push_back(arr[4]);
          eq[arr[0]].push_back(arr[4]);
          eq[arr[4]].push_back(arr[0]);
          missing.push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[2];
          doNextSimple = true;
        } else if (ret == 1) {
          process(arr[2], true);
          diff[arr[0]].push_back(arr[4]);
          diff[arr[4]].push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[0];
          doNextSimple = true;
        } else {
          process(arr[0], true);
          process(arr[2], true);
          process(arr[4], true);
        }
      }
    } else if (b.size() > 1) {
      vector<int> arr;
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(v[pos]), ++pos;
        arr.push_back(b[0]);
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(v[pos]), ++pos;
        arr.push_back(b[1]); 
      }
      // if (!doNextSimple) {
      //   nextPos(v, pos);
      //   if (pos < (int) v.size()) arr.push_back(v[pos]), ++pos;
      // }
 
      doNextSimple = false;
      int ret = use_machine(arr);
      if (arr.size() == 2) {
        if (ret == 1) {
          process(arr[0], true);
        } else {
          process(arr[0], false);
        }
      } else if (arr.size() == 4) {
        if (ret == 3) {
          process(arr[0], true);
          process(arr[2], true);
        } else if (ret == 2) {
          process(arr[0], false);
          process(arr[2], true);
        } else if (ret == 1) {
          process(arr[0], true);
          process(arr[2], false); 
        } else {
          process(arr[0], false);
          process(arr[2], false);
        }
      } else if (arr.size() == 5) {
        if (ret == 4) {
          process(arr[0], true);
          process(arr[2], true);
          process(arr[4], true);
        } else if (ret == 3) {
          process(arr[2], true);
          diff[arr[0]].push_back(arr[4]);
          diff[arr[4]].push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[0];
          doNextSimple = true;
        } else if (ret == 2) {
          diff[arr[0]].push_back(arr[2]);
          diff[arr[2]].push_back(arr[0]);
          diff[arr[4]].push_back(arr[2]);
          diff[arr[2]].push_back(arr[4]);
          eq[arr[0]].push_back(arr[4]);
          eq[arr[4]].push_back(arr[0]);
          missing.push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[2];
          doNextSimple = true;
        } else if (ret == 1) {
          process(arr[2], false);
          diff[arr[0]].push_back(arr[4]);
          diff[arr[4]].push_back(arr[0]);
          missing.push_back(arr[4]);
          --pos;
          v[pos] = arr[0];
          doNextSimple = true;
        } else {
          process(arr[0], false);
          process(arr[2], false);
          process(arr[4], false);
        }
      }
    }*/

    if (a.size() > 2) {
      vector<int> arr;
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(a[0]);
        arr.push_back(v[pos]), ++pos;
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(a[1]);
        arr.push_back(v[pos]), ++pos; 
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(a[2]);
        arr.push_back(v[pos]), ++pos; 
      }

      doNextSimple = false;
      int ret = use_machine(arr);
      if (arr.size() == 2) {
        if (ret == 1) {
          process(arr[1], false);
        } else {
          process(arr[1], true);
        }
      } else if (arr.size() == 4) {
        if (ret == 3) {
          process(arr[1], false);
          process(arr[3], false);
        } else if (ret == 2) {
          process(arr[1], false);
          process(arr[3], true);
        } else if (ret == 1) {
          process(arr[1], true);
          process(arr[3], false); 
        } else {
          process(arr[1], true);
          process(arr[3], true);
        }
      } else if (arr.size() == 6) {
        if (ret == 5) {
          process(arr[1], false);
          process(arr[3], false);
          process(arr[5], false);
        } else if (ret == 4) {
          process(arr[1], false);
          process(arr[3], false);
          process(arr[5], true);
        } else if (ret == 3) {
          process(arr[5], false);
          diff[arr[1]].push_back(arr[3]);
          diff[arr[3]].push_back(arr[1]);
          missing.push_back(arr[1]);
          --pos;
          v[pos] = arr[3];
          // if (pos + 2 < (int) v.size()) swap(v[pos], v[pos + 2]);
          doNextSimple = true;
        } else if (ret == 2) {
          process(arr[5], true);
          diff[arr[1]].push_back(arr[3]);
          diff[arr[3]].push_back(arr[1]);
          missing.push_back(arr[1]);
          --pos;
          v[pos] = arr[3];
          // if (pos + 2 < (int) v.size()) swap(v[pos], v[pos + 2]);
          doNextSimple = true;
        } else if (ret == 1) {
          process(arr[1], true);
          process(arr[3], true);
          process(arr[5], false);
        } else {
          process(arr[1], true);
          process(arr[3], true);
          process(arr[5], true);
        }
      }
    } else if (b.size() > 2) {
      vector<int> arr;
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(b[0]);
        arr.push_back(v[pos]), ++pos;
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(b[1]);
        arr.push_back(v[pos]), ++pos; 
      }
      nextPos(v, pos);
      if (pos < (int) v.size()) {
        arr.push_back(b[2]);
        arr.push_back(v[pos]), ++pos; 
      }

      doNextSimple = false;
      int ret = use_machine(arr);
      if (arr.size() == 2) {
        if (ret == 1) {
          process(arr[1], true);
        } else {
          process(arr[1], false);
        }
      } else if (arr.size() == 4) {
        if (ret == 3) {
          process(arr[1], true);
          process(arr[3], true);
        } else if (ret == 2) {
          process(arr[1], true);
          process(arr[3], false);
        } else if (ret == 1) {
          process(arr[1], false);
          process(arr[3], true); 
        } else {
          process(arr[1], false);
          process(arr[3], false);
        }
      } else if (arr.size() == 6) {
        if (ret == 5) {
          process(arr[1], true);
          process(arr[3], true);
          process(arr[5], true);
        } else if (ret == 4) {
          process(arr[1], true);
          process(arr[3], true);
          process(arr[5], false);
        } else if (ret == 3) {
          process(arr[5], true);
          diff[arr[1]].push_back(arr[3]);
          diff[arr[3]].push_back(arr[1]);
          missing.push_back(arr[3]);
          --pos;
          v[pos] = arr[1];
          // if (pos + 2 < (int) v.size()) swap(v[pos], v[pos + 2]);
          doNextSimple = true;
        } else if (ret == 2) {
          process(arr[5], false);
          diff[arr[1]].push_back(arr[3]);
          diff[arr[3]].push_back(arr[1]);
          missing.push_back(arr[3]);
          --pos;
          v[pos] = arr[1];
          // if (pos + 2 < (int) v.size()) swap(v[pos], v[pos + 2]);
          doNextSimple = true;
        } else if (ret == 1) {
          process(arr[1], false);
          process(arr[3], false);
          process(arr[5], true);
        } else {
          process(arr[1], false);
          process(arr[3], false);
          process(arr[5], false);
        }
      }
    }
    else {
      vector<int> arr = {a[0]};
      nextPos(v, pos);
      if (pos < (int) v.size()) arr.push_back(v[pos]), ++pos;
      else break;

      doNextSimple = false;
      int ret = use_machine(arr);
      if (ret & 1) {
        process(arr[1], false);
      } else {
        process(arr[1], true);
      }
    }
  }

  ans = a.size();

  // if (a.size() + b.size() != n) exit(-1);

  for (int x : missing) {
    if (!found.count(x))
      v.push_back(x);
  }

  if (a.size() >= b.size()) {
    while (pos < (int) v.size()) {
      vector<int> arr;
      int used = 0;
      for (int i = 0; i < (int) a.size(); ++i) {
        arr.push_back(a[i]);
        nextPos(v, pos);
        if (pos < (int) v.size()) {
          if (i + 1 == (int) a.size()) {
            arr.push_back(v.back());
            v.pop_back();
          } else {
            arr.push_back(v[pos]), ++pos;
          }
          ++used;
        } else break;
      }
      int ret = use_machine(arr);
      int diff = (ret / 2) + (ret & 1);
      ans += used - diff;
      if (ret & 1) {
        b.push_back(arr.back());
      } else {
        a.push_back(arr.back());
      }
    }
  } else {
    while (pos < (int) v.size()) {
      vector<int> arr;
      int used = 0;
      for (int i = 0; i < (int) b.size(); ++i) {
        arr.push_back(b[i]);
        nextPos(v, pos);
        if (pos < (int) v.size()) {
          if (i + 1 == (int) b.size()) {
            arr.push_back(v.back());
            v.pop_back();
          } else {
            arr.push_back(v[pos]), ++pos;
          }
          ++used;
        } else break;
      }
      int ret = use_machine(arr);
      int diff = (ret / 2) + (ret & 1);
      ans += diff;
      if (ret & 1) {
        a.push_back(arr.back());
      } else {
        b.push_back(arr.back());
      }
    }
  }

  return ans;
}

// int count_mushrooms(int n) {
//   int ans = 1;
//   for (int i = 1; i < n; i += 2) {
//     vector<int> v;
//     if (i + 1 < n) v = {i, 0, i + 1};
//     else v = {i, 0};
//     int ret = use_machine(v);
//     ans += (v.size() - 1) - ret;
//   }
//   return ans;
// }

// int main() {
//   ios::sync_with_stdio(false);

//   return 0; 
// }

Compilation message

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:66:8: warning: variable 'doNextSimple' set but not used [-Wunused-but-set-variable]
   66 |   bool doNextSimple = false;
      |        ^~~~~~~~~~~~
mushrooms.cpp:68:10: warning: unused variable 'COEF' [-Wunused-variable]
   68 |   double COEF = 1.2;
      |          ^~~~

Subtask #1
97.4138 / 100.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 256 KB Output is correct
2 Correct 0 ms 256 KB Output is correct
3 Correct 1 ms 256 KB Output is correct
4 Correct 0 ms 256 KB Output is correct
5 Correct 1 ms 256 KB Output is correct
6 Correct 2 ms 256 KB Output is correct
7 Correct 7 ms 512 KB Output is correct
8 Correct 8 ms 512 KB Output is correct
9 Correct 10 ms 512 KB Output is correct
10 Correct 8 ms 512 KB Output is correct
11 Correct 9 ms 512 KB Output is correct
12 Correct 8 ms 512 KB Output is correct
13 Correct 8 ms 512 KB Output is correct
14 Correct 5 ms 512 KB Output is correct
15 Partially correct 8 ms 512 KB Output is partially correct
16 Correct 9 ms 512 KB Output is correct
17 Correct 5 ms 384 KB Output is correct
18 Correct 8 ms 512 KB Output is correct
19 Partially correct 9 ms 512 KB Output is partially correct
20 Correct 8 ms 512 KB Output is correct
21 Correct 9 ms 512 KB Output is correct
22 Correct 11 ms 512 KB Output is correct
23 Correct 10 ms 512 KB Output is correct
24 Correct 5 ms 384 KB Output is correct
25 Correct 9 ms 512 KB Output is correct
26 Correct 9 ms 512 KB Output is correct
27 Correct 10 ms 512 KB Output is correct
28 Correct 11 ms 512 KB Output is correct
29 Partially correct 10 ms 512 KB Output is partially correct
30 Partially correct 12 ms 512 KB Output is partially correct
31 Partially correct 11 ms 512 KB Output is partially correct
32 Correct 9 ms 512 KB Output is correct
33 Correct 9 ms 512 KB Output is correct
34 Partially correct 9 ms 512 KB Output is partially correct
35 Partially correct 8 ms 512 KB Output is partially correct
36 Partially correct 9 ms 512 KB Output is partially correct
37 Partially correct 9 ms 512 KB Output is partially correct
38 Partially correct 11 ms 512 KB Output is partially correct
39 Partially correct 9 ms 512 KB Output is partially correct
40 Correct 11 ms 640 KB Output is correct
41 Partially correct 9 ms 512 KB Output is partially correct
42 Partially correct 10 ms 512 KB Output is partially correct
43 Partially correct 9 ms 512 KB Output is partially correct
44 Partially correct 8 ms 512 KB Output is partially correct
45 Partially correct 9 ms 512 KB Output is partially correct
46 Correct 12 ms 512 KB Output is correct
47 Partially correct 10 ms 512 KB Output is partially correct
48 Partially correct 9 ms 512 KB Output is partially correct
49 Correct 9 ms 512 KB Output is correct
50 Partially correct 9 ms 512 KB Output is partially correct
51 Partially correct 9 ms 512 KB Output is partially correct
52 Partially correct 12 ms 512 KB Output is partially correct
53 Correct 8 ms 512 KB Output is correct
54 Partially correct 8 ms 512 KB Output is partially correct
55 Partially correct 9 ms 512 KB Output is partially correct
56 Correct 9 ms 512 KB Output is correct
57 Partially correct 9 ms 512 KB Output is partially correct
58 Partially correct 9 ms 512 KB Output is partially correct
59 Correct 9 ms 512 KB Output is correct
60 Partially correct 14 ms 512 KB Output is partially correct
61 Partially correct 9 ms 512 KB Output is partially correct
62 Correct 0 ms 256 KB Output is correct
63 Correct 0 ms 256 KB Output is correct
64 Correct 0 ms 256 KB Output is correct
65 Correct 0 ms 256 KB Output is correct
66 Correct 0 ms 256 KB Output is correct
67 Correct 0 ms 256 KB Output is correct
68 Correct 0 ms 256 KB Output is correct
69 Correct 0 ms 256 KB Output is correct
70 Correct 1 ms 256 KB Output is correct
71 Correct 1 ms 256 KB Output is correct
72 Correct 0 ms 256 KB Output is correct
73 Correct 1 ms 256 KB Output is correct
74 Correct 0 ms 256 KB Output is correct
75 Correct 0 ms 256 KB Output is correct
76 Correct 0 ms 256 KB Output is correct
77 Correct 0 ms 256 KB Output is correct
78 Correct 1 ms 256 KB Output is correct
79 Correct 1 ms 256 KB Output is correct
80 Correct 0 ms 256 KB Output is correct
81 Correct 1 ms 360 KB Output is correct
82 Correct 0 ms 256 KB Output is correct
83 Correct 0 ms 256 KB Output is correct
84 Correct 0 ms 256 KB Output is correct
85 Correct 0 ms 256 KB Output is correct
86 Correct 0 ms 256 KB Output is correct
87 Correct 1 ms 256 KB Output is correct
88 Correct 0 ms 256 KB Output is correct
89 Correct 0 ms 256 KB Output is correct
90 Correct 1 ms 256 KB Output is correct
91 Correct 1 ms 256 KB Output is correct