Submission #628312

#	Time	Username	Problem	Language	Result	Execution time	Memory
628312		Kaitokid	Rarest Insects (IOI22_insects)	C++17	99.78 / 100	67 ms	412 KiB

insects

    #include "insects.h"
    #include<bits/stdc++.h>
    using namespace std;
    /*vector<int>A;
    int fr[20009];
    int cnt[3];
    void move_inside(int x)
    {
        cnt[0]++;
        cout<<"in "<<x<<endl;
        fr[A[x]]++;
    }
    void move_outside(int x)
    {
        cnt[1]++;
        cout<<"out "<<x<<endl;
        fr[A[x]]--;
    }
    int press_button()
    {
        cnt[2]++;
        cout<<"press"<<endl;
        int res=0;
        for(int i=0;i<2000;i++)res=max(res,fr[i]);
        return res;
    }*/
    int n,dst;
    stack<int>st;
    bool nt[20009];

    bool ch(int x)
    {
        while(!st.empty()){move_outside(st.top());st.pop();}
        int sz=0;
        vector<int>g;
        for(int i=0;i<n;i++)
        {
            if(nt[i])continue;
            if(sz==0){st.push(i);move_inside(i);sz++;continue;}
            move_inside(i);
            if(press_button()>x){move_outside(i);g.push_back(i);continue;}
            sz++;
            st.push(i);
        }
        if(sz==x*dst)
        {
            while(!st.empty()){nt[st.top()]=true;move_outside(st.top());st.pop();}
            return true;

        }
        for(int i=0;i<g.size();i++)nt[g[i]]=true;
        return false;

    }
    int rss;
    int min_cardinality(int N)
    {
        rss=0;
        n=N;
        dst=0;
        move_inside(0);
        st.push(0);
        dst++;
        for(int i=1;i<n;i++)
        {
            move_inside(i);
            if(press_button()==1){st.push(i);dst++;}
               else move_outside(i);
        }
        int l=1,r=n/dst;
        while(l<r)
        {
            int mid=(l+r+1)/2;
            if(ch(mid)){l=0;r-=mid;rss+=mid;}
            else r=mid-1;
        }
        return l+rss;
    }
    /*
    int main()
    {

       A={5,8,9,5,9,9};
       cout<<min_cardinality(6)<<endl;
       cout<<cnt[0]<<" "<<cnt[1]<<" "<<cnt[2]<<endl;
        return 0;
    }
    */

Compilation message (stderr)

insects.cpp: In function 'bool ch(int)':
insects.cpp:51:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   51 |         for(int i=0;i<g.size();i++)nt[g[i]]=true;
      |                     ~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.78 / 75