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Submission #802757

# Submission time Handle Problem Language Result Execution time Memory
802757 2023-08-02T14:04:35 Z 12345678 Watching (JOI13_watching) C++17
50 / 100
 166 ms 16012 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: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+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 0 ms 212 KB Output is correct
3 Correct 0 ms 340 KB Output is correct
4 Correct 0 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 676 KB Output is correct
14 Correct 1 ms 608 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 0 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 212 KB Output is correct
6 Correct 1 ms 212 KB Output is correct
7 Correct 7 ms 8476 KB Output is correct
8 Correct 68 ms 14220 KB Output is correct
9 Correct 17 ms 9332 KB Output is correct
10 Correct 16 ms 9044 KB Output is correct
11 Correct 166 ms 15948 KB Output is correct
12 Correct 88 ms 16012 KB Output is correct
13 Correct 9 ms 8404 KB Output is correct
14 Correct 9 ms 8404 KB Output is correct
15 Incorrect 12 ms 8460 KB Output isn't correct
16 Halted 0 ms 0 KB -