Submission #1112801

#	Time	Username	Problem	Language	Result	Execution time	Memory
1112801		mariaclara	Rainforest Jumps (APIO21_jumps)	C++17	33 / 100	4062 ms	5296 KiB

jumps

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

using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
const int MAXN = 2e5+5;
#define all(x) x.begin(), x.end()
#define sz(x) (int) x.size()
#define mk make_pair 
#define pb push_back 
#define fr first 
#define sc second 

int n, a[MAXN], l_max[MAXN], r_max[MAXN];
void init(int N, vector<int> H) {
    n = N;

    for(int i = 1; i <= N; i++) a[i] = H[i-1];
    a[0] = a[N+1] = N+1;

    for(int i = 1; i <= N; i++) {
        l_max[i] = i-1;
        while(a[l_max[i]] < a[i]) l_max[i] = l_max[l_max[i]];
    }

    for(int i = N; i >= 1; i--) {
        r_max[i] = i+1;
        while(a[r_max[i]] < a[i]) r_max[i] = r_max[r_max[i]];
    }
}

int minimum_jumps(int A, int B, int C, int D) {
    A++; B++; C++; D++;
    queue<int> fila;
    vector<int> vis(n+2);
    vis[0] = vis[n+1] = 1;

    for(int i = A; i <= B; i++) fila.push(i), vis[i] = 1;

    int ans = n;
    while(!fila.empty()) {
        int x = fila.front();
        fila.pop();

        if(C <= x and x <= D) ans = min(ans, vis[x] - 1);

        if(!vis[l_max[x]]) vis[l_max[x]] = vis[x] + 1, fila.push(l_max[x]);
        if(!vis[r_max[x]]) vis[r_max[x]] = vis[x] + 1, fila.push(r_max[x]);
    }

    if(ans == n) return -1;
    return ans;
}

• 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