Submission #836005

#	Time	Username	Problem	Language	Result	Execution time	Memory
836005		enerelt14	Global Warming (CEOI18_glo)	C++14	100 / 100	53 ms	4304 KiB

glo

#include <algorithm>
#include <array>
#include <bitset>
#include <cassert>
#include <chrono>
#include <climits>
#include <cmath>
#include <complex>
#include <cstring>
#include <functional>
#include <iomanip>
#include <iostream>
#include <map>
#include <numeric>
#include <queue>
#include <random>
#include <set>
#include <vector>
using namespace std;

#define pb push_back

const int MX = 2e5 + 5;

int n, x, t[MX], num[MX];
vector<int> lis;

int find(int l, int r, int val) {
	if(l == r) {
		if(lis[l] < val) return l;
		else return l - 1;
	}
	int mid = (l + r) / 2;
	if(lis[mid] < val) return find(mid + 1, r, val);
	else return find(l, mid, val);
}

int rfind(int l, int r, int val) {
	if(l == r) {
		if(lis[l] > val) return l;
		else return l - 1;
	}
	int mid = (l + r) / 2;
	if(lis[mid] > val) return rfind(mid + 1, r, val);
	else return rfind(l, mid, val);
}

int main() {
	ios::sync_with_stdio(0);cin.tie(0);
	cin >> n >> x;
	for(int i = 1; i <= n; i++) cin >> t[i];
	num[1] = 1;
	lis.pb(t[1]);
	for(int i = 2; i <= n; i++) {
		num[i] = find(0, (int)lis.size() - 1, t[i]) + 2;
		if(num[i] == (int)lis.size() + 1) lis.pb(t[i]);
		else lis[num[i] - 1] = t[i];
	}
	int ans = num[n];
	lis.clear();
	lis.pb(t[n] + x);
	for(int i = n - 1; i > 0; i--) {
		int k = rfind(0, (int)lis.size() - 1, t[i]) + 1;
		ans = max(ans, k + num[i]);
		k = rfind(0, (int)lis.size() - 1, t[i] + x) + 1;
		if(k == (int)lis.size()) lis.pb(t[i] + x);
		else lis[k] = t[i] + x;
	}
	cout << ans;
}

• 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