Submission #1241709

#	Time	Username	Problem	Language	Result	Execution time	Memory
1241709		trantrungkein	Watching (JOI13_watching)	C++20	0 / 100	1 ms	328 KiB

watching

#include <bits/stdc++.h>
#define int long long
using namespace std;

const int N = 2e5 + 5;
int n, P, Q, a[N];

bool check(int mid) {
    int i = 1;
    int p = P, q = Q;

    while (i <= n) {
        int j = i, cnt1 = 0, cnt2 = 0, pq = i+1, pp = i+1;
        while (p && j <= n && a[j] - a[i] <= mid - 1) j++, cnt1++, pp = j;
        j = i;
        while (q && j <= n && a[j] - a[i] <= 2 * mid - 1) j++, cnt2++, pq = j;
        if(cnt2 == 0 && cnt1 == 0) return false;
        if(cnt2 <= cnt1)
        {
            // use P
            p--;
            i = pp;
        }
        else 
        {
            q--;
            i = pq;
        }
     
    }
    return true;
}

signed main() {
    ios::sync_with_stdio(0);
    cin.tie(0);
    cin >> n >> P >> Q;
    for (int i = 1; i <= n; ++i) cin >> a[i];
    sort(a + 1, a + n + 1); 

    int l = 1, r = 1e16, ans = -1;
    while (l <= r) {
        int mid = (l + r) / 2;
        if (check(mid)) {
            ans = mid;
            r = mid - 1;
        } else {
            l = mid + 1;
        }
    }

    cout << ans << '\n';
}

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