Submission #1168714

#	Time	Username	Problem	Language	Result	Execution time	Memory
1168714		chikien2009	Watching (JOI13_watching)	C++20	100 / 100	87 ms	15944 KiB

watching

#include <bits/stdc++.h>

using namespace std;

inline void setup()
{
    ios_base::sync_with_stdio(0);
    cin.tie(0);
    cout.tie(0);
}

int n, p, q, a[2001], f[2001][2001], l = 1, r = 1e9, m, res = 1;

inline bool Check(int inp)
{
    for (int i = 1, p1 = 1, p2 = 1; i <= n; ++i)
    {
        while (a[p1] + inp - 1 < a[i])
        {
            p1++;
        }
        while (a[p2] + 2 * inp - 1 < a[i])
        {
            p2++;
        }
        for (int j = 0; j <= p; ++j)
        {
            f[i][j] = (j > 0 ? min(f[p1 - 1][j - 1], f[p2 - 1][j] + 1) : f[p2 - 1][j] + 1);
        }
    }
    return (f[n][p] <= q);
}

int main()
{
    setup();

    cin >> n >> p >> q;
    p = min(p, n);
    for (int i = 1; i <= n; ++i)
    {
        cin >> a[i];
    }
    sort(a + 1, a + 1 + n);
    while (l <= r)
    {
        m = (l + r) >> 1;
        if (Check(m))
        {
            r = m - 1;
            res = m;
        }
        else
        {
            l = m + 1;
        }
    }
    cout << res;
    return 0;
}

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