Submission #1307623

#	Time	Username	Problem	Language	Result	Execution time	Memory
1307623		JelaByteEngineer	Watching (JOI13_watching)	C++20	0 / 100	1098 ms	327680 KiB

watching

#include <bits/stdc++.h>
#define ll long long
using namespace std;
bool ok (int mid, int n, int p, int q, vector <ll> &niz)
{
    vector <int> poslm(n), poslv(n);
    for (int i=0; i<n; i++)
    {
        poslm[i]=lower_bound(niz.begin(), niz.end(), niz[i]+mid)-niz.begin();
        poslv[i]=lower_bound(niz.begin(), niz.end(), niz[i]+2*mid)-niz.begin();
    }
    vector <vector <int>> dp(q+1, vector <int> (n+1, 1e9));
    dp[0][0]=0;
    for (int i=0; i<n; i++)
    {
        for (int j=0; j<=q; j++)
        {
            if (dp[j][i]==1e9) continue;
            dp[j][poslm[i]]=min(dp[j][poslm[i]], dp[j][i]+1);
            if (j<q) dp[j+1][poslv[i]]=min(dp[j+1][poslv[i]], dp[j][i]);
        }
    }
    for (int i=0; i<=q; i++)
    {
        if (dp[i][n]<=p) return true;
    }
    return false;
}
int main()
{
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int n, p, q;
    cin>>n>>p>>q;
    vector <ll> niz(n);
    for (int i=0; i<n; i++)
    {
        cin>>niz[i];
    }
    sort (niz.begin(), niz.end());
    int ans=1e9;
    int l=1, r=1e9;
    while (l<=r)
    {
        int mid=l+(r-l)/2;
        if (ok(mid, n, p, q, niz))
        {
            r=mid-1;
            ans=min(ans, mid);
        }
        else
        {
            l=mid+1;
        }
    }
    cout<<ans<<endl;
    return 0;
}

• Subtask 1: 0 / 50
• Subtask 2: 0 / 50