Submission #949430

#	Time	Username	Problem	Language	Result	Execution time	Memory
949430		glebustim	Global Warming (CEOI18_glo)	C++17	100 / 100	51 ms	4768 KiB

glo

#include <bits/extc++.h>
using namespace std;
using namespace __gnu_pbds;

#define fast ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0)
#define all(a) a.begin(), a.end()
using ll = long long;
using ld = long double;
using pii = pair<int, int>;
using vi = vector<int>;
using oset = tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update>;

const int INF = 2e9 + 10;

int main() {
    fast;
    int n, x;
    cin >> n >> x;
    vi a(n);
    for (int i = 0; i < n; ++i)
        cin >> a[i];
    vi b(n + 1, INF);
    b[0] = -INF;
    vi d(n);
    for (int i = n - 1; i >= 0; --i) {
        int j = lower_bound(all(b), -a[i]) - b.begin();
        b[j] = -a[i];
        d[i] = j;
    }
    b.assign(n + 1, INF);
    b[0] = -INF;
    int ans = 0;
    for (int i = 0; i < n; ++i) {
        int j = lower_bound(all(b), a[i] + x) - b.begin();
        ans = max(ans, d[i] + j - 1);
        j = lower_bound(all(b), a[i]) - b.begin();
        b[j] = a[i];
    }
    cout << ans << '\n';
}

• Subtask 1: 5 / 5
• Subtask 2: 10 / 10
• Subtask 3: 13 / 13
• Subtask 4: 10 / 10
• Subtask 5: 20 / 20
• Subtask 6: 17 / 17
• Subtask 7: 25 / 25