제출 #248625

#제출 시각아이디문제언어결과실행 시간메모리
248625SortingGlobal Warming (CEOI18_glo)C++14
100 / 100
154 ms7928 KiB
#include <bits/stdc++.h>

using namespace std;

const int k_N = 4e5 + 3;
const int k_Inf = 1e9 + 3;

struct Fenwick{
    int a[2 * k_N];

    void update(int i, int d){
        for(++i; i < k_N; i += i & -i)
            a[i] = max(d, a[i]);
    }

    int query(int i){
        int ans = 0;
        for(++i; i >= 1; i -= i & -i)
            ans = max(a[i], ans);
        return ans;
    }
};

int n, x;
int t[k_N], st[2 * k_N];

Fenwick f[2];

int main(){
    ios::sync_with_stdio(false);
    cin.tie(NULL);

    cin >> n >> x;
    for(int i = 0; i < n; ++i)
        cin >> t[i];

    for(int i = 0; i < n; ++i){
        st[2 * i] = t[i];
        st[2 * i + 1] = t[i] + x;
    }
    sort(st, st + 2 * n);

    for(int i = 0; i < n; ++i){
        int p1 = lower_bound(st, st + 2 * n, t[i]) - st;
        int p2 = lower_bound(st, st + 2 * n, t[i] + x) - st;

        int a = f[0].query(p1 - 1);
        int b = f[0].query(p2 - 1);
        int c = f[1].query(p2 - 1);

        f[0].update(p1, a + 1);
        f[1].update(p2, max(b, c) + 1);
    }

    cout << f[1].query(2 * n) << "\n";
}
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...
#Verdict Execution timeMemoryGrader output
Fetching results...