Submission #413616

#	Time	Username	Problem	Language	Result	Execution time	Memory
413616		daniel920712	Rainforest Jumps (APIO21_jumps)	C++14	0 / 100	4070 ms	29076 KiB

jumps

#include "jumps.h"

#include <vector>
#include <queue>
#include <stack>
#include <stdio.h>
using namespace std;
int r[25][200005];
int l[25][200005];
int Pow[25];
stack < int > all;
vector < int > high;

void init(int N, std::vector<int> H)
{
    high=H;
    int i,j,k;
    Pow[0]=1;
    for(i=1;i<=20;i++) Pow[i]=Pow[i-1]*2;
    for(i=0;i<=20;i++)
    {
        for(j=0;j<N;j++)
        {
            r[i][j]=j;
            l[i][j]=j;
        }
    }
    for(i=0;i<N;i++)
    {
        while(!all.empty()&&H[all.top()]<H[i])
        {
            r[0][all.top()]=i;
            all.pop();
        }
        all.push(i);

    }
    while(!all.empty()) all.pop();
    for(i=N-1;i>=0;i--)
    {
        while(!all.empty()&&H[all.top()]<H[i])
        {
            l[0][all.top()]=i;
            all.pop();
        }
        all.push(i);
    }
    while(!all.empty()) all.pop();
    for(i=1;i<=20;i++)
    {
        for(j=0;j<N;j++)
        {
            for(k=l[i-1][j];k<=r[i-1][j];k++)
            {
                l[i][j]=min(l[i][j],l[i-1][k]);
                r[i][j]=max(r[i][j],r[i-1][k]);
            }
        }
    }
    return ;
}

int minimum_jumps(int A, int B, int C, int D)
{
    int ans=0,now=A,i,j,ll=A,rr=B,x,y,ok=0;
    for(i=A;i<=B;i++) for(j=C;j<=D;j++) ok=ok||(high[j]>high[i]);
    if(!ok) return -1;
    if(!(B<C||D<A)) return 0;
    for(i=20;i>=0;i--)
    {
        x=ll;
        y=rr;
        for(j=ll;j<=rr;j++)
        {
            x=min(x,l[i][j]);
            y=max(y,r[i][j]);
        }
        //printf("%d %d %d %d %d\n",ll,rr,x,y,i);
        if(y<C||D<x)
        {
            ans+=Pow[i];
            ll=x;
            rr=y;
        }

    }
    x=ll;
    y=rr;
    for(j=ll;j<=rr;j++)
    {
        x=min(x,l[0][j]);
        y=max(y,r[0][j]);
    }
    //printf("%d %d %d %d\n",ll,rr,x,y);
    if(y<C||D<x)
    {
        return -1;
    }

    return ans+1;
}

Compilation message (stderr)

jumps.cpp: In function 'int minimum_jumps(int, int, int, int)':
jumps.cpp:65:15: warning: unused variable 'now' [-Wunused-variable]
   65 |     int ans=0,now=A,i,j,ll=A,rr=B,x,y,ok=0;
      |               ^~~

• 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