Submission #1130325

#	Time	Username	Problem	Language	Result	Execution time	Memory
1130325		juliany2	Sparklers (JOI17_sparklers)	C++20	0 / 100	0 ms	328 KiB

sparklers

#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define all(x) (x).begin(), (x).end()

const int N = 1e3 + 7;
int n, k;
ll t, a[N];

ll cdiv(ll x, ll y) {
    if (y == 0) return 0;
    return (x + y - 1) / y;
}

int main() {
    cin.tie(0)->sync_with_stdio(false);

    cin >> n >> k >> t;

    for (int i = 1; i <= n; i++)
        cin >> a[i];

    a[0] = -1e18, a[n + 1] = 1e18;

    ll ans = 0;
    int l = k, r = k;

    for (int i = 1; i < n; i++) {
        ll x = cdiv(a[r] - a[l - 1], 2 * t * i);
        ll y = cdiv(a[r + 1] - a[l], 2 * t * i);

        if (x < y) {
            l--;
            ans = max(ans, x);
        } else {
            r++;
            ans = max(ans, y);
        }
    }

    cout << ans << '\n';

    return 0;
}

• Subtask 1: 0 / 30
• Subtask 2: 0 / 20
• Subtask 3: 0 / 50