Submission #397805

#	Time	Username	Problem	Language	Result	Execution time	Memory
397805		sinamhdv	Global Warming (CEOI18_glo)	C++11	100 / 100	67 ms	2756 KiB

glo

// CEOI18_glo
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int, int> pii;
typedef pair<ll, ll> pll;
const int mod = 1000 * 1000 * 1000 + 7;
const int INF = 2e9 + 100;
const ll LINF = 1e18 + 100;

#ifdef DEBUG
#define dbg(x) cout << #x << " = " << (x) << endl << flush;
#define dbgr(s, f) { cout << #s << ": "; for (auto _ = (s); _ != (f); _++) cout << *_ << ' '; cout << endl << flush; }
#else
#define dbg(x) ;
#define dbgr(s, f) ;
#endif
#define FOR(i, a, b) for (int i = (a); i < (b); i++)
#define fast_io ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define all(x) (x).begin(), (x).end()
#define pb push_back
#define mp make_pair
#define fr first
#define sc second
#define endl '\n'

#define MAXN 200100

int n, x;
int a[MAXN];
int fw[MAXN];
int dp[MAXN];

int32_t main(void)
{
	fast_io;
	cin >> n >> x;
	FOR(i, 0, n) cin >> a[i];
	
	dp[0] = INF;
	for (int i = n - 1; i >= 0; i--)
	{
		int pos = lower_bound(dp, dp + n + 1, a[i], greater<int>()) - dp;
		fw[i] = pos;
		dp[pos] = a[i];
	}

	int ans = 0;
	fill(dp, dp + MAXN, INF);
	dp[0] = -INF;
	FOR(i, 0, n)
	{
		int pos = lower_bound(dp, dp + n + 1, a[i] + x) - dp - 1;
		ans = max(ans, pos + fw[i]);
		pos = lower_bound(dp, dp + n + 1, a[i]) - dp;
		dp[pos] = a[i];
	}

	cout << ans << endl;

	return 0;
}

• 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