Submission #984012

#	Time	Username	Problem	Language	Result	Execution time	Memory
984012		Marcus	Rainforest Jumps (APIO21_jumps)	C++17	0 / 100	1 ms	344 KiB

jumps

#include "jumps.h"
#include <vector>
#include <bits/stdc++.h>
using namespace std;
int n;
vector<int> h;
vector<int> r;
vector<int> l;

void init(int N, std::vector<int> H) {
    n = N;
    for (auto u: H) {h.push_back(u);}
    h.shrink_to_fit();

    r.resize(n);
    l.resize(n);

    for (int i=0; i<n; i++)
    {
        r[i] = -1;
        for (int j=i; j<n; j++)
        {
            if (h[j] > h[i]) {r[i] = j; break;};
        }
    }
    for (int i=0; i<n; i++)
    {
        l[i] = -1;
        for (int j=i; j>=0; j--)
        {
            if (h[j] > h[i]) {l[i] = j; break;}
        }
    }
}

int minimum_jumps(int A, int B, int C, int D) {
  vector<int> start;
  vector<int> end;
  vector<bool> stop(n);
  for (int i=A; i<=B; i++) {start.push_back(h[i]);}
  for (int i=C; i<=D; i++) {end.push_back(h[i]); stop[i] = true;}
  sort(start.begin(), start.end());
  sort(end.begin(), end.end());
  if (end.back() < start[0]) {return -1;}

  int point = A;
  for (int i=0; i<(int)start.size(); i++) {if (start[i] < end.back()) point = A+i;}
  int answer = 0;
  for (int i=0; i<n; i++)
  {
    answer++;
    int pre = l[point]; int suff = r[point];
    if (stop[pre] || stop[suff]) {break;}
    if (pre != -1 && h[pre] < end.back()) 
    {
        if (h[pre] > h[point]) {point = pre;}
    }
    if (suff != -1 && h[suff] < end.back()) 
    {
        if (h[suff] > h[point]) {point = suff;}
    }
  }
  return answer;
}

• 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