Submission #924283

#	Time	Username	Problem	Language	Result	Execution time	Memory
924283		NK_	Global Warming (CEOI18_glo)	C++17	100 / 100	136 ms	18892 KiB

glo

// Success consists of going from failure to failure without loss of enthusiasm
#include <bits/stdc++.h>

using namespace std;

#define nl '\n'
#define sz(x) int(x.size())
#define pb push_back

template<class T> using V = vector<T>;
using vi = V<int>;

struct BIT {
	vi A; int N; void init(int n) { N = n; A = vi(N, 0); }
	void upd(int p, int x) { for(++p;p<=N;p+=p&-p) A[p-1] = max(A[p-1], x); }
	int get(int r) { int s = 0; for(;r;r-=r&-r) s = max(s, A[r-1]); return s; }
};

int main() {
	cin.tie(0)->sync_with_stdio(0);
	
	int N, K; cin >> N >> K;

	vi A(N), X; for(auto& x : A) {
		cin >> x; X.pb(x); X.pb(x + K);
	}

	sort(begin(X), end(X));

	V<BIT> B(2); B[0].init(2 * N), B[1].init(2 * N);

	V<vi> dp(N, vi(2, 0));

	int ans = 0;
	for(int i = 0; i < N; i++) {
		int x = lower_bound(begin(X), end(X), A[i]) - begin(X);
		int xk = lower_bound(begin(X), end(X), A[i] + K) - begin(X);

		dp[i][0] = B[0].get(x) + 1;
		dp[i][1] = max(B[0].get(xk), B[1].get(xk)) + 1;

		// cout << i << " => " << x << " " << xk << endl;
		// cout << dp[i][0] << " " << dp[i][1] << endl;
		// cout << endl;

		ans = max({ans, dp[i][0], dp[i][1]});

		B[0].upd(x, dp[i][0]);
		B[1].upd(xk, dp[i][1]);
	}

	cout << ans << nl;

	exit(0-0);
}

• 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