Submission #1173232

#	Time	Username	Problem	Language	Result	Execution time	Memory
1173232		davele	Rarest Insects (IOI22_insects)	C++20	99.76 / 100	15 ms	440 KiB

insects

#ifndef davele
#include "insects.h"
#endif // davele

#include <bits/stdc++.h>
//#define int long long
#define pii pair<int, int>
#define fi first
#define se second
#define vi vector <int>
#define pq priority_queue
#define MASK(i) (1ll<<(i))
#define BIT(x, i) (((x) >> (i)) & 1)
#define x0 ___x0
#define y0 ___y0
#define div   ___div
#define next   ___next
#define prev   ___prev
#define left   ___left
#define right   ___right
#define pos pisosi
#define pb push_back
#define pf push_front
using namespace std;

//const int mod = ;
//void add (int &a, const int&b){
//    a+=b;
//    if (a>=mod) a-=mod;
//}
//
//void sub (int&a, const int&b){
//    a-=b;
//    if (a<0) a+=mod;
//}
//
//void mul (int&a, const int&b){
//    a*=b;
//    a%=mod;
//}

template<class X, class Y>
    bool minimize(X &x, const Y&y){
        if (x<=y) return false;
        else{
            x = y;
            return true;
        }
    }
template<class X, class Y>
    bool maximize (X &x, const Y&y){
        if (x>=y) return false;
        else{
            x = y;
            return true;
        }
    }

////////////////////////////////////////////////////////////////////////////
const int lim = 2e3, limit = lim+5;

int n, inMachine[limit], ini[limit], old[limit];
bool banned[limit], curbanned[limit];

#ifdef davele
int cnti, cnto, cntp;
int A[limit], ts[limit];
void move_inside( int i ){
    cnti++;
//    cerr<<"i "<<i<<"\n";
    ts[A[i]]++;
}
void move_outside (int i){
    cnto++;
//    cerr<<"o "<<i<<"\n";
    ts[A[i]]--;
}
int press_button(){
    cntp++;
//    cerr<<"p \n";
    int ret = 1;
    for (int i=0; i<=lim; i++) maximize (ret, ts[i]);
    return ret;
}
#endif // davele

int min_cardinality (int N){
    n = N;
    //
    int numDiff = 0;
    for (int i=0; i<n; i++){
        banned[i] = false;
        move_inside(i);
        if (press_button()>1){
            move_outside(i);
            inMachine[i] = false;
            ini[i] = false;
        }
        else{
            ini[i] = true;
            numDiff++;
            inMachine[i] = true;
        }
    }
//    cerr<<numDiff<<"\n";
    int numCur = numDiff;
    //
    int left = 1, right = N/numDiff, ret = 1;
    int loop = 0;
    while (left<=right){
        loop ++;
        int mid = (left+right)/2;
        int num = numCur;
        for (int i=0; i<n; i++) curbanned[i] = banned[i];
        for (int i=0; i<n; i++) old[i] = inMachine[i];
        for (int i = 0; i < n; i++){
            if (inMachine[i] || banned[i]) continue;
            move_inside(i);
            numCur++;
            inMachine[i] = true;
//            cerr<<press_button()<<"\n";
            if (press_button()>mid){
                move_outside(i);
                numCur--;
                inMachine[i] = false;
                curbanned[i] = true;
            }
        }
//        cerr<<mid<<" "<<numCur<<" "<<numDiff<<"\n";
        if (numCur==(numDiff*mid)){
            ret = mid;
            left = mid+1;
        }
        else{
            right = mid-1;
            for (int i=0; i<n; i++){
                if (inMachine[i] && !old[i]) move_outside(i);
                inMachine[i] = old[i];
            }
            for (int i=0; i<n; i++) banned[i] = curbanned[i];
            numCur = num;
        }
    }
//    cerr<<"loop "<<loop<<"\n";
    return ret;
}
/*
signed main(){
    freopen("insects.inp", "r", stdin);
    freopen("insects.out", "w", stdout);
    int n;
    cin>>n;
    for (int i=0; i<n; i++) cin>>A[i];
    cout<<min_cardinality(n);
    cerr<<"inside "<<cnti<<" outside "<<cnto<<" press "<<cntp<<"\n";
}
*/

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.76 / 75