Submission #718637

#	Time	Username	Problem	Language	Result	Execution time	Memory
718637		lam	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	2 ms	2640 KiB

jumps

#include "jumps.h"
#include <bits/stdc++.h>
#include <vector>
using namespace std;
const int maxn = 1e5 + 10;
int n,d[maxn];
int a[maxn];
vector <int> adj[maxn];

void addedge(int u, int v)
{
    adj[u].push_back(v);
}
void init(int N, std::vector<int> H) {
    n=N;
    for (int i=0; i<n; i++) a[i]=H[i],adj[i].clear();
    deque<int> dq;
    for (int i=0; i<n; i++)
    {
        while (!dq.empty()&&a[dq.back()] < a[i]) dq.pop_back();
        if (!dq.empty()) addedge(i,dq.back());
    }
    while (!dq.empty()) dq.pop_back();
    for (int i=n-1; i>=0; i--)
    {
        while (!dq.empty()&&a[dq.back()] < a[i]) dq.pop_back();
        if (!dq.empty()) addedge(i,dq.back());
    }
}

int minimum_jumps(int A, int B, int C, int D) {
    queue<int> q;
    fill_n(d,n,-1);
    for (int i=C; i<=D; i++)
    {
        d[i]=0;
        q.push(i);
    }
    while (!q.empty())
    {
        int u=q.front(); q.pop();
        for (int v:adj[u])
            if (d[v]==-1)
        {
            d[u]=d[v]+1;
            q.push(v);
        }
    }
    int ans=1e9;
    for (int i=A; i<=B; i++) if (d[i]!=-1) ans=min(ans,d[i]);
    if (ans==1e9) ans=-1;
    return ans;
}

• 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