Submission #1047502

#	Time	Username	Problem	Language	Result	Execution time	Memory
1047502		Marco_Escandon	Rainforest Jumps (APIO21_jumps)	C++11	4 / 100	695 ms	94772 KiB

jumps

#include "jumps.h"

#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
ll n;
vector<vector<ll>>PD,PI;
vector<vector<ll>> cad;
vector<ll> vD;
void dfs(ll node, ll d)
{
    vD[node]=d;
    for(auto i:cad[node])
        dfs(i,d+1);
}
void init(int N, std::vector<int> h)
{
    n=N; stack<ll> q;
    PD.assign(24,vector<ll>(n+6,n+5));
    PI.assign(24,vector<ll>(n+6,-1));
    cad.resize(n+6);vD.resize(n+6);
    for(int i=0; i<n; i++)
    {
        while(!q.empty()&&h[i]>h[q.top()])
        {
            PD[0][q.top()]=i;
            q.pop();
        }
        if(!q.empty()) PI[0][i]=q.top();
        q.push(i);
    }
    for(int i=0; i<n; i++)
        cad[PD[0][i]].push_back(i);
    for(int i=1; i<24; i++)
        for(int j=0; j<n+6; j++)
            PD[i][j]=PD[i-1][PD[i-1][j]];
    dfs(n+5,0);
}
ll sol(ll node, ll a, ll b)
{
    ll c=0;
    for(int i=23; i>-1; i--)
    {
        if(vD[PD[i][node]]>vD[a])
        {
            c+=(1<<i);
            node=PD[i][node];
        }
    }
    node=PD[0][node];
    if(node>b) return 1e9;
    return c+1;
}
int minimum_jumps(int A, int B, int C, int D)
{
    ll c1=0;
    ll p=B;
    ll bs=1e9;
    while(p!=-1)
    {
        bs=min(bs,c1+sol(p,C,D));
        p=PI[0][p];
        if(p<A) c1++;
    }
    if(bs==1e9) bs=-1;
    return bs;
}

• Subtask 1: 4 / 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