Submission #1329062

#	Time	Username	Problem	Language	Result	Execution time	Memory
1329062		liptonek	Infinite Race (EGOI24_infiniterace2)	C++20	100 / 100	14 ms	1476 KiB

Main

#include <bits/stdc++.h>
using namespace std;

int main()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);

    int n,q;
    cin>>n>>q;

    vector<bool> behind(n,false);
    vector<int> indices;

    long long total=0;

    for(int i=0; i<q; i++)
    {
        int x;
        cin>>x;

        if(x>0)
        {
            if(behind[x])
            {
                total++;

                for(int idx : indices)
                {
                    behind[idx]=false;
                }

                indices.clear();
            }

            if(!behind[x])
            {
                behind[x]=true;

                indices.push_back(x);
            }
        }
        else
        {
            int target=-x;

            behind[target]=false;
        }
    }

    cout<<total<<endl;

    return 0;
}

• Subtask 1: 29 / 29
• Subtask 2: 34 / 34
• Subtask 3: 22 / 22
• Subtask 4: 15 / 15