oj.uz

Submission #1058192

# Submission time Handle Problem Language Result Execution time Memory
1058192 2024-08-14T08:52:58 Z mychecksedad Rarest Insects (IOI22_insects) C++17
0 / 100
 99 ms 720 KB 
#include "insects.h"
#include <bits/stdc++.h>
using namespace std;
#define pb push_back
#define en cout << '\n'
#define all(x) x.begin(),x.end()
#define pii pair<int,int>
#define vi vector<int>
#define ff first
#define ss second
const int N = 1e5+10;


mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int r(int l, int r){
  return uniform_int_distribution<int>(l, r)(rng);
}
vector<bool> used(N);
vector<int> v;
int n;
int test(int x){
  move_inside(x);
  int last_car = 1;
  vector<int> in;
  in.pb(x);
  for(int i =0 ; i < n; ++i){
    if(!used[v[i]]){
      move_inside(v[i]);
      int car = press_button();
      if(car == last_car){
        move_outside(v[i]);
      }else{
        in.pb(v[i]);
        used[v[i]] = 1;
        last_car++;
      }
    }
  }
  for(int x: in) move_outside(x);
    // cout << x << ' ' << last_car << '\n';
  return last_car;
}
int uniq;
bool is_big(int k){
  int co = 0, tot = 0;
  for(int i = 0; i < n; ++i){
    // if(!used[v[i]]){
      tot++;
      move_inside(v[i]);
      co++;
      int car = press_button();
      if(car > k){
        move_outside(v[i]);
        --co;
      }
    // }
  }
  if(k * uniq == co){
    return 1;
  }
  return 0;
}
int min_cardinality(int nn) { n=nn;
  
  for(int i = 0; i < n; ++i) v.pb(i);
  for(int i = 1; i < n; ++i) swap(v[i], v[r(0, i)]); 

  int last_car = 1;
  move_inside(v[0]);
  vector<int> a;
  a.pb(v[0]);
  for(int i = 1; i < n; ++i){
    move_inside(v[i]);
    v.pb(v[i]);
    int car = press_button();
    a.pb(v[i]);
    if(car > 1){
      move_outside(v[i]);
      a.pop_back();
    }
    // cout << i << endl;
  }
  uniq = a.size();
  if(a.size() <= 1){
    int ans = n;
    for(int c: a) used[c] = 1;
    for(int c: a) move_outside(c);
    for(int c: a){
      ans = min(ans, test(c));
    }
    return ans;
  }
  // if(a.size() > n/2){
  //   return 1;
  // }
  // for(int c: a) used[c] = 1;
  for(int c: a) move_outside(c);
  int l = 1, r = n / a.size(); int ans = r + 1;
  while(l <= r){
    int m = l+r>>1;
    if(is_big(m)){
      ans = m;
      l = m + 1;
    }else{
      r = m - 1;
    }
  }
  return ans;
}

Compilation message

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:100:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  100 |     int m = l+r>>1;
      |             ~^~
insects.cpp:68:7: warning: unused variable 'last_car' [-Wunused-variable]
   68 |   int last_car = 1;
      |       ^~~~~~~~

Subtask #1
0 / 10.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 2 ms 344 KB Output is correct
7 Correct 3 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Incorrect 6 ms 344 KB Wrong answer.
13 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 344 KB Output is correct
2 Correct 0 ms 340 KB Output is correct
3 Correct 1 ms 344 KB Output is correct
4 Correct 1 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Correct 2 ms 344 KB Output is correct
7 Correct 3 ms 344 KB Output is correct
8 Correct 5 ms 344 KB Output is correct
9 Correct 5 ms 344 KB Output is correct
10 Correct 8 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Incorrect 6 ms 344 KB Wrong answer.
13 Halted 0 ms 0 KB -

Subtask #3
0 / 75.0

# Verdict Execution time Memory Grader output
1 Correct 0 ms 344 KB Output is correct
2 Correct 0 ms 344 KB Output is correct
3 Correct 0 ms 344 KB Output is correct
4 Correct 0 ms 344 KB Output is correct
5 Correct 1 ms 344 KB Output is correct
6 Partially correct 1 ms 344 KB Output is partially correct
7 Correct 18 ms 472 KB Output is correct
8 Correct 19 ms 604 KB Output is correct
9 Partially correct 54 ms 472 KB Output is partially correct
10 Partially correct 57 ms 476 KB Output is partially correct
11 Partially correct 99 ms 344 KB Output is partially correct
12 Correct 23 ms 720 KB Output is correct
13 Partially correct 69 ms 344 KB Output is partially correct
14 Incorrect 67 ms 600 KB Wrong answer.
15 Halted 0 ms 0 KB -