Submission #276005

#	Time	Username	Problem	Language	Result	Execution time	Memory
276005		Hehehe	Global Warming (CEOI18_glo)	C++14	100 / 100	76 ms	5108 KiB

glo

#include<bits/stdc++.h> //:3
using namespace std;
typedef long long ll;
#define all(a) (a).begin(), (a).end()
#define ff first
#define ss second
#define pb push_back
#define mp make_pair
#define pi pair<int, int>
#define sz(x) (int)((x).size())
//#define int long long

const int dx[] = {0, 1, 0, -1};
const int dy[] = {1, 0, -1, 0};

const ll inf = 2e9;
const ll mod = 1e9 + 7;
const int N = 2e6 + 11;
const ll INF64 = 3e18 + 1;
const double eps = 1e-14;
const double PI = acos(-1);

//ifstream in(".in");
//ofstream out(".out");

int n, m, a[N], x, len[N];


void solve(){

    cin >> n >> x;

    vector<int> high;

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

        auto it = lower_bound(all(high), a[i]);

        if(it == high.end()){
            high.push_back(a[i]);
            len[i] = sz(high);
            continue;
        }

        high[it - high.begin()] = a[i];
        len[i] = it - high.begin() + 1;
    }

    int ans = 0;

    vector<int> LSD;

    for(int i = n; i > 0; i--){

        auto it = lower_bound(all(LSD), -a[i]);

        ans = (it == LSD.end() ? max(ans, len[i] + sz(LSD)) : max(ans, len[i] + (int)(it - LSD.begin())));

        auto it1 = lower_bound(all(LSD), -a[i] - x);

        if(it1 == LSD.end())LSD.push_back(-a[i] - x);else LSD[it1 - LSD.begin()] = -a[i] - x;
    }


    cout << ans << '\n';

}

int32_t main(){
ios_base :: sync_with_stdio(0); cin.tie(0); cout.tie(0);

    cout << setprecision(6) << fixed;

    int T = 1;
    //cin >> T;
    while(T--){
        solve();
    }
}

• 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