Submission #533725

#	Time	Username	Problem	Language	Result	Execution time	Memory
533725		Sharky	Global Warming (CEOI18_glo)	C++17	100 / 100	57 ms	8516 KiB

glo

#include <bits/stdc++.h>
using namespace std;
#define int long long
const int inf = 1e18;
signed main() {
    ios::sync_with_stdio(0); cin.tie(0);
    int n, x; cin >> n >> x;
    vector<int> a(n), L(n), R(n);
    for (int i = 0; i < n; i++) cin >> a[i];
    vector<int> dp(n, inf);
    int mx = 0;
    for (int i = 0; i < n; i++) {
        int j = lower_bound(dp.begin(), dp.end(), a[i]) - dp.begin();
        dp[j] = a[i];
        L[i] = j + 1;
    }
    fill(dp.begin(), dp.end(), inf);
    for (int i = n - 1; i >= 0; i--) {
        int pos = lower_bound(dp.begin(), dp.end(), -(a[i] - x)) - dp.begin();
        R[i] = pos;
        pos = lower_bound(dp.begin(), dp.end(), -a[i]) - dp.begin();
        dp[pos] = -a[i];
    }
    for (int i = 0; i < n; i++) {
        mx = max(mx, L[i] + R[i]);
    }
    cout << mx << "\n";
    return 0;
}

• 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