oj.uz

Submission #1058259

# Submission time Handle Problem Language Result Execution time Memory
1058259 2024-08-14T09:08:22 Z mychecksedad Rarest Insects (IOI22_insects) C++17
0 / 100
 74 ms 592 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;
  vi in;
  for(int i = 0; i < n; ++i){
    if(!used[v[i]]){
      tot++;
      move_inside(v[i]);
      co++;
      int car = press_button();
      in.pb(v[i]);
      if(car > k){
        move_outside(v[i]);
        in.pop_back();
        --co;
      }
      // cout << car << ' ' << v[i] << ' ' << k << '\n';
    }
  }
  for(int x: in) move_outside(x);
  // cout << co << ' ' << uniq << ' ' << k << '\n';
  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() <= 7){
    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 x: a) cout << x << ' ';
  // cout << "wtf";
  for(int c: a) move_outside(c);
  int l = 1, r = (n - a.size()) / a.size(); int ans = r;
  while(l <= r){
    int m = l+r>>1;
    if(is_big(m)){
      // cout << m << ' ';
      ans = m;
      l = m + 1;
    }else{
      r = m - 1;
    }
  }
  return ans + 1;
}

Compilation message

insects.cpp: In function 'int min_cardinality(int)':
insects.cpp:99:15: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   99 |   if(a.size() > n/2){
      |      ~~~~~~~~~^~~~~
insects.cpp:108:14: warning: suggest parentheses around '+' inside '>>' [-Wparentheses]
  108 |     int m = l+r>>1;
      |             ~^~
insects.cpp:74:7: warning: unused variable 'last_car' [-Wunused-variable]
   74 |   int last_car = 1;
      |       ^~~~~~~~

Subtask #1
0 / 10.0

# 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 0 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 2 ms 344 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 2 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Incorrect 2 ms 344 KB Wrong answer.
14 Halted 0 ms 0 KB -

Subtask #2
0 / 15.0

# 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 0 ms 344 KB Output is correct
6 Correct 1 ms 344 KB Output is correct
7 Correct 1 ms 344 KB Output is correct
8 Correct 2 ms 344 KB Output is correct
9 Correct 4 ms 344 KB Output is correct
10 Correct 2 ms 344 KB Output is correct
11 Correct 1 ms 344 KB Output is correct
12 Correct 4 ms 344 KB Output is correct
13 Incorrect 2 ms 344 KB Wrong answer.
14 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 0 ms 344 KB Output is correct
6 Correct 0 ms 344 KB Output is correct
7 Correct 9 ms 472 KB Output is correct
8 Correct 7 ms 344 KB Output is correct
9 Partially correct 74 ms 464 KB Output is partially correct
10 Partially correct 60 ms 584 KB Output is partially correct
11 Correct 15 ms 592 KB Output is correct
12 Incorrect 14 ms 344 KB Wrong answer.
13 Halted 0 ms 0 KB -