Submission #720558

#	Time	Username	Problem	Language	Result	Execution time	Memory
720558		bin9638	Counting Mushrooms (IOI20_mushrooms)	C++17	0 / 100	1 ms	208 KiB

mushrooms

#include <bits/stdc++.h>

#ifndef SKY
#include "mushrooms.h"
#endif // SKY

using namespace std;

#define N 100010
#define ll long long
#define fs first
#define sc second
#define ii pair<int,int>
#define pb push_back

#ifdef SKY
int type[N];
int use_machine(vector<int>s)
{
    int res=0;
    for(int i=0;i<s.size()-1;i++)
        res+=(type[s[i]]!=type[s[i+1]]);
    return res;
}
#endif // SKY

int n;
vector<int>A,B;

int count_mushrooms(int cc)
{
    n=cc;
    A.clear();
    B.clear();
    A.pb(0);
    int res=1;
    for(int i=1;i<n;)
    {
        if(A.size()>B.size())
        {
            vector<int>hoi;
            for(int j=i;j<min(n,i+(int)A.size());j++)
            {
                hoi.pb(j);
                hoi.pb(A[j-i]);
            }
            int val=use_machine(hoi);
            res+=((val+1)/2);
            if(val&1)
                A.pb(i);
                    else B.pb(i);
            i+=A.size();
        }else
        {
            vector<int>hoi;
            int cnt=0;
            for(int j=i;j<min(n,i+(int)B.size());j++)
            {
                hoi.pb(j);
                hoi.pb(B[j-i]);
                cnt++;
            }
            int val=use_machine(hoi);
            res+=(cnt-((val+1)/2));
            if(val&1)
                B.pb(i);
                    else A.pb(i);
            i+=B.size();
        }
    }
    return res;
}

#ifdef SKY
int main()
{
    freopen("A.inp","r",stdin);
    freopen("A.out","w",stdout);
    ios::sync_with_stdio(0);
    cin.tie(NULL);
    cout.tie(NULL);
    int n;
    cin>>n;
    for(int i=0;i<n;i++)
        cin>>type[i];
    cout<<count_mushrooms(n);
    return 0;
}
#endif

• Subtask 1: 0 / 100