Submission #740530

#	Time	Username	Problem	Language	Result	Execution time	Memory
740530		Berryisbetter	Rainforest Jumps (APIO21_jumps)	C++17	4 / 100	972 ms	8092 KiB

jumps

#include <bits/stdc++.h>
#include "jumps.h"

using namespace std;

using ll = long long;
vector<ll> seg, br, d; ll n;
ll qw(ll a, ll b) {
	b++;
	ll ans = 0;
	for (a += n, b += n; a < b; a /= 2, b /= 2) {
		if (a % 2) {
			ans = max(ans, seg[a]);
			a++;
		}
		if (b % 2) {
			b--;
			ans = max(ans, seg[b]);
		}
	}
	return ans;
}
ll ind(ll v, ll a, ll b) {
	if (a == b) {
		return a;
	}
	ll m = (a + b) / 2;
	if (qw(a, m) >= v) {
		return ind(v, a, m);
	}
	return ind(v, m + 1, b);
}


void init(int N, std::vector<int> H) {
	n = N;
	seg = vector<ll>(2 * n + 1, 0);
	//segment setup
	for (ll i = 0; i < n; i++) {
		seg[i + n] = H[i];
	}
	for (ll i = n - 1; i > 0; i--) {
		seg[i] = max(seg[2 * i], seg[2 * i + 1]);
	}
	//br setup
	br = vector<ll>(n, 0); for (ll i = 0; i < n; i++) { br[i] = i + 1; }
	for (ll i = n - 1; i >= 0; i--) {
		ll j = i;
		while (br[j] != n) {
			if (H[i] < H[br[j]]) {
				break;
			}
			j = br[j];
		}
		br[i] = br[j];
	}
	//distance
	d = vector<ll>(n + 1); d[n] = 0;
	for (ll i = n - 1; i >= 0; i--) {
		d[i] = d[br[i]] + 1;
	}
}
//ind,qw,d
int minimum_jumps(int A, int B, int C, int D) {

	ll w=qw(B,C-1);
	ll x = ind(w, C, D);
	if (w>seg[n+x]){
		return -1;
	}
	if (d[B] > d[x]) {
		return d[B] - d[x];
	}
	return -1;
}

/*#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int main() {
	ll n; cin >> n;
	vector<ll> a(n), r(n);
	for (ll i = 0; i < n; i++) {
		cin >> a[i];
		r[i] = i - 1;
	}
	for (ll i = 0; i < n; i++) {
		ll j = i;
		while (r[j] != -1) {
			if (a[i] > a[r[j]]) {
				break;
			}
			j = r[j];
		}
		r[i] = r[j];
		cout << r[i] + 1 << '\n';
	}
}*/

• Subtask 1: 4 / 4
• Subtask 2: 0 / 8
• Subtask 3: 0 / 13
• Subtask 4: 0 / 12
• Subtask 5: 0 / 23
• Subtask 6: 0 / 21
• Subtask 7: 0 / 19