Submission #983860

#	Time	Username	Problem	Language	Result	Execution time	Memory
983860		The_Samurai	Rainforest Jumps (APIO21_jumps)	C++17	33 / 100	4059 ms	4480 KiB

jumps

#include "jumps.h"
#include "bits/stdc++.h"
using namespace std;

const int lg = 18, N = 2e5 + 5, inf = 1e9;
vector<int> l(N), r(N);
int n;

void init(int N, vector<int> H) {
    n = N;
    stack<int> s;
    for (int i = n - 1; i >= 0; i--) {
        while (!s.empty() and H[s.top()] < H[i]) s.pop();
        r[i] = s.empty() ? n : s.top();
        s.push(i);
    }
    while (!s.empty()) s.pop();
    for (int i = 0; i < n; i++) {
        while (!s.empty() and H[s.top()] < H[i]) s.pop();
        l[i] = s.empty() ? -1 : s.top();
        s.push(i);
    }
}

int minimum_jumps(int a, int b, int c, int d) {
    queue<int> q;
    vector<int> ans(n, inf);
    for (int i = a; i <= b; i++) ans[i] = 0, q.push(i);
    while (!q.empty()) {
        int x = q.front(); q.pop();
        if (c <= x and x <= d) return ans[x];
        if (l[x] >= 0 and ans[l[x]] > ans[x] + 1) {
            ans[l[x]] = ans[x] + 1;
            q.push(l[x]);
        }
        if (r[x] < n and ans[r[x]] > ans[x] + 1) {
            ans[r[x]] = ans[x] + 1;
            q.push(r[x]);
        }
    }
    return -1;
}

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