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Submission #802746

# Submission time Handle Problem Language Result Execution time Memory
802746 2023-08-02T13:59:29 Z 12345678 Watching (JOI13_watching) C++17
50 / 100
 165 ms 16028 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=2e3+5;
int n, p, q, dp[nx][nx];
vector<int> v;

bool can(int w)
{
    for (int i=0; i<n; i++)
    {
        int ps=(upper_bound(v.begin(), v.end(), v[i]-w)-v.begin())-1;
        int pb=(upper_bound(v.begin(), v.end(), v[i]-2*w)-v.begin())-1;
        for (int j=0; j<=q; j++) dp[i][j]=1e9, dp[i][j]=min((pb==-1||j==0)?(j==0?nx:1):dp[pb][j-1], (ps==-1)?1:dp[ps][j]+1);
    }
    return dp[n-1][q]<=p;
}

int main()
{
    cin.tie(NULL)->sync_with_stdio(false);
    cin>>n>>p>>q;
    v.resize(n);
    for (auto &x:v) cin>>x;
    sort(v.begin(), v.end());
    if (p+q>=n)
    {
        cout<<1;
        return 0;
    }
    int l=1, r=1e9;
    while (l<r)
    {
        int md=(l+r)/2;
        //cout<<md<<'\n';
        if (can(md)) r=md;
        else l=md+1;
    }
    cout<<l;
}

Subtask #1
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 1 ms 724 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 1 ms 332 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 2 ms 724 KB Output is correct
8 Correct 1 ms 724 KB Output is correct
9 Correct 1 ms 724 KB Output is correct
10 Correct 1 ms 724 KB Output is correct
11 Correct 1 ms 724 KB Output is correct
12 Correct 1 ms 724 KB Output is correct
13 Correct 1 ms 724 KB Output is correct
14 Correct 1 ms 724 KB Output is correct
15 Correct 1 ms 724 KB Output is correct

Subtask #2
0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8276 KB Output is correct
2 Correct 1 ms 212 KB Output is correct
3 Correct 1 ms 340 KB Output is correct
4 Correct 1 ms 340 KB Output is correct
5 Correct 1 ms 340 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 10 ms 8404 KB Output is correct
8 Correct 70 ms 14180 KB Output is correct
9 Correct 21 ms 9300 KB Output is correct
10 Correct 16 ms 8940 KB Output is correct
11 Correct 165 ms 16028 KB Output is correct
12 Correct 95 ms 15956 KB Output is correct
13 Correct 10 ms 8516 KB Output is correct
14 Correct 12 ms 8404 KB Output is correct
15 Incorrect 10 ms 8504 KB Output isn't correct
16 Halted 0 ms 0 KB -