Submission #433395

#	Time	Username	Problem	Language	Result	Execution time	Memory
433395		fvogel499	Global Warming (CEOI18_glo)	C++14	100 / 100	125 ms	8484 KiB

glo

/*
File created on 06/19/2021 at 18:39:52.
Link to problem: https://oj.uz/problem/view/CEOI18_glo
Description: 
Time complexity: O()
Space complexity: O()
Status: DEV
Copyright: Ⓒ 2021 Francois Vogel
*/

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
#include <functional>

using namespace std;
using namespace __gnu_pbds;

#define pii pair<int, int>
#define f first
#define s second

#define pb push_back
#define ins insert
#define cls clear

#define int ll
#define ll long long

typedef tree<int, null_type, less<int>, rb_tree_tag, tree_order_statistics_node_update> ordered_set;

const int inf = 1e18;

signed main() {
    cin.tie(0);
    // ios_base::sync_with_stdio(0);

    int n, x;
    cin >> n >> x;
    int b [n];
    for (int i = 0; i < n; i++) cin >> b[i];
    vector<int> dp(n, inf);
    int mxv = 0;
    int lp [n];
    for (int i = 0; i < n; i++) {
        int j = lower_bound(dp.begin(), dp.end(), b[i])-dp.begin();
        lp[i] = j+1;
        mxv = max(mxv, lp[i]);
        dp[j] = b[i];
    }
    for (int i = 0; i < n; i++) b[i] *= -1;
    dp = vector<int>(n, inf);
    for (int i = n-1; i >= 0; i--) {
        int useful = lower_bound(dp.begin(), dp.end(), b[i]+x)-dp.begin();
        mxv = max(mxv, lp[i]+useful);
        int j = lower_bound(dp.begin(), dp.end(), b[i])-dp.begin();
        dp[j] = b[i];
    }
    cout << mxv;

    int d = 0;
    d++;
}

• 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