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Submission #802765

# Submission time Handle Problem Language Result Execution time Memory
802765 2023-08-02T14:08:58 Z 12345678 Watching (JOI13_watching) C++17
100 / 100
 159 ms 15956 KB 
#include <bits/stdc++.h>

using namespace std;

const int nx=2e3+10;
int n, p, q, dp[nx][nx], ans;
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:0):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+1000;
    while (l<r)
    {
        int md=(l+r)/2;
        //cout<<md<<'\n';
        if (can(md)) r=md;
        else l=md+1;
    }
    cout<<r;
}

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 0 ms 340 KB Output is correct
4 Correct 1 ms 212 KB Output is correct
5 Correct 0 ms 212 KB Output is correct
6 Correct 0 ms 212 KB Output is correct
7 Correct 1 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
50.0 / 50.0

# Verdict Execution time Memory Grader output
1 Correct 6 ms 8276 KB Output is correct
2 Correct 0 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 0 ms 212 KB Output is correct
6 Correct 1 ms 340 KB Output is correct
7 Correct 7 ms 8404 KB Output is correct
8 Correct 68 ms 14216 KB Output is correct
9 Correct 17 ms 9328 KB Output is correct
10 Correct 15 ms 9044 KB Output is correct
11 Correct 159 ms 15956 KB Output is correct
12 Correct 86 ms 15956 KB Output is correct
13 Correct 9 ms 8508 KB Output is correct
14 Correct 9 ms 8404 KB Output is correct
15 Correct 10 ms 8488 KB Output is correct