Submission #925006

#	Time	Username	Problem	Language	Result	Execution time	Memory
925006		TAhmed33	Rainforest Jumps (APIO21_jumps)	C++17	0 / 100	1 ms	2392 KiB

jumps

#include <bits/stdc++.h>
using namespace std;
const int MAXN = 2e5 + 25;
int a[MAXN], nxt[MAXN], prv[MAXN];
int n;
void init (int N, vector <int> h) {
	n = N;
	for (int i = 0; i < n; i++) a[i] = h[i];
	stack <int> cur;
	cur.push(0);
	for (int i = 1; i < n; i++) {
		while (!cur.empty() && a[i] > a[cur.top()]) {
			nxt[cur.top()] = i;
			cur.pop();
		}
		cur.push(i);
	}
	while (!cur.empty()) {
		nxt[cur.top()] = -1;
		cur.pop();
	}
	cur.push(n - 1);
	for (int i = n - 2; i >= 0; i--) {
		while (!cur.empty() && a[i] > a[cur.top()]) {
			prv[cur.top()] = i;
			cur.pop();
		}
		cur.push(i);
	}
	while (!cur.empty()) {
		prv[cur.top()] = -1;
		cur.pop();
	}
}
int minimum_jumps (int a, int b, int c, int d) {
	int dist[n];
	for (int i = 0; i < n; i++) dist[i] = n + 1;
	queue <int> cur;
	for (int i = a; i <= b; i++) {
		dist[i] = n + 1;
		cur.push(i);
	}
	while (!cur.empty()) {
		auto k = cur.front();
		cur.pop();
		if (nxt[k] != -1) {
			if (dist[nxt[k]] == n + 1) {
				dist[nxt[k]] = dist[k] + 1;
				cur.push(nxt[k]);
			}
		}
		if (prv[k] != -1) {
			if (dist[prv[k]] == n + 1) {
				dist[prv[k]] = dist[k] + 1;
				cur.push(prv[k]);
			}
		}
	}
	int mn = n + 1;
	for (int i = c; i <= d; i++) mn = min(mn, dist[i]);
	if (mn == n + 1) return -1;
	return mn;
}

• Subtask 1: 0 / 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