Submission #980313

#	Time	Username	Problem	Language	Result	Execution time	Memory
980313		vjudge1	Rainforest Jumps (APIO21_jumps)	C++17	0 / 100	1 ms	2392 KiB

jumps

#include <bits/stdc++.h>
using namespace std;
// #define int long long
#define fastio ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0);
#define nl "\n"

int n;
vector<int> h;
const int maxn = 200005;
pair<int, int> adj[maxn]; //left, right
int dist[maxn];

void init(int N, vector<int> H){
    n = N;
    h = H;
    stack<int> tree;
    for(int i=0; i<n; i++){
        while(!tree.empty() && h[tree.top()]<h[i]) tree.pop();
        if(!tree.empty()) adj[i].first = tree.top();
        else adj[i].first = -1;
        tree.push(i);
    }
    while(!tree.empty()) tree.pop();
    for(int i=n-1; i>=0; i--){
        while(!tree.empty() && h[tree.top()]<h[i]) tree.pop();
        if(!tree.empty()) adj[i].second = tree.top();
        else adj[i].second = -1;
        tree.push(i);
    }
}

int minimum_jumps(int A, int B, int C, int D){
    queue<int> q;
    for (int i=A; i<=B; i++) {
        q.push(i);
        dist[i] = 0;
    }
    while(!q.empty()){
        int v = q.front();
        q.pop();
        if(C<=v && v<=D){
            return dist[v];
        }
        int i = adj[v].first;
        if(i!=-1 && dist[i]>dist[v]+1){
            dist[i] = dist[v]+1;
            q.push(i);
        }
        int j = adj[v].second;
        if(j!=-1 && dist[j]>dist[v]+1){
            dist[j] = dist[v]+1;
            q.push(j);
        }
    }
    return -1;
}

• 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