Submission #1061572

#	Time	Username	Problem	Language	Result	Execution time	Memory
1061572		alexdd	Rainforest Jumps (APIO21_jumps)	C++17	0 / 100	4010 ms	5720 KiB

jumps

#include "jumps.h"
#include <bits/stdc++.h>
using namespace std;
vector<int> H;
const int INF = 1e9;
int parent[200005];
int tole[200005],tori[200005];
void init(int N, std::vector<int> copH)
{
    H=copH;
    deque<int> dq;
    for(int i=0;i<=N;i++)
    {
        while(!dq.empty() && H[dq.back()] < H[i])
            dq.pop_back();
        if(dq.empty())
            tole[i]=-1;
        else
            tole[i]=dq.back();
        dq.push_back(i);
    }
    dq.clear();
    for(int i=N-1;i>=0;i--)
    {
        while(!dq.empty() && H[dq.back()] < H[i])
            dq.pop_back();
        if(dq.empty())
            tori[i]=N;
        else
            tori[i]=dq.back();
        dq.push_back(i);
    }

}
int getmax(int le, int ri)
{
    int mxm=0;
    for(int i=le;i<=ri;i++)
        mxm = max(mxm, H[i]);
    return mxm;
}
int getdist(int cur, int le, int ri)
{
    int pasi=0,mxm=getmax(le,ri);
    while(1)
    {
        if(tori[cur]>ri || H[cur] > mxm)
            return INF;
        if(tori[cur]>=le && tori[cur]<=ri)
            return pasi+1;
        if(H[tole[cur]] > H[tori[cur]] && H[tole[cur]] < mxm)
        {
            cur = tole[cur];
        }
        else
        {
            cur = tori[cur];
        }
        pasi++;
    }
    return pasi;
}
int minimum_jumps(int A, int B, int C, int D)
{
    int mnm=INF;
    for(int i=A;i<=B;i++)
    {
        int x = getdist(i,C,D);
        if(x<INF)
        {
            mnm=x;
            break;
        }
    }
    if(mnm==INF)
        return -1;
    else
        return mnm;
}

• 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