Submission #847073

#	Time	Username	Problem	Language	Result	Execution time	Memory
847073		NeroZein	Rarest Insects (IOI22_insects)	C++17	99.83 / 100	36 ms	936 KiB

insects

#include "insects.h"
#include<bits/stdc++.h>
using namespace std;
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) {
            for (int j = i + 1; j < n; ++j) {
              g.push_back(j); 
            }
          break;
        }
    }
    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;
}

Compilation message (stderr)

insects.cpp: In function 'bool ch(int)':
insects.cpp:34:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   34 |     for(int i=0;i<g.size();i++)nt[g[i]]=true;
      |                 ~^~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 15 / 15
• Subtask 3: 74.83 / 75