Submission #740935

#	Time	Username	Problem	Language	Result	Execution time	Memory
740935		rnl42	Global Warming (CEOI18_glo)	C++14	100 / 100	60 ms	4620 KiB

glo

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

constexpr int INF = 2e9;

int N, X;
vector<int> T;

int main() {
    ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
    cin >> N >> X;
    T.resize(N);
    for (int i = 0; i < N; i++) {
        cin >> T[i];
    }
    int ans = 0;
    vector<int> d(N, INF);
    vector<int> m(N);
    d[0] = -INF;
    for (int i = 0; i < N; i++) {
        auto it = lower_bound(d.begin(), d.end(), T[i]+X);
        m[i] = it - d.begin();
        it = lower_bound(d.begin(), d.end(), T[i]);
        *it = min(*it, T[i]);
    }
    fill(d.begin()+1, d.end(), INF);
    for (int i = N-1; i >= 0; i--) {
        auto it = lower_bound(d.begin(), d.end(), -T[i]);
        m[i] += it - d.begin() - 1;
        ans = max(ans, m[i]);
        *it = min(*it, -T[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