제출 #922218

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
922218		Arp	밀림 점프 (APIO21_jumps)	C++17	0 / 100	4067 ms	5848 KiB

jumps

#include<bits/stdc++.h>
using namespace std;

const int N = 2e5 + 10;
int ml[N],mr[N];
int best[N];
int arr[N];
int MAXN;
void init(int n,vector<int> a){
  for(int i = 1;i<=n;i++){
    ml[i] = 0;
    mr[i] = n + 1;
    arr[i] = a[i - 1];
  }  
  MAXN = n;
  arr[0] = arr[n + 1] = -1;
  stack<int> lg;
  for(int i = 1;i<=n;i++){
    while(lg.size() > 0 && arr[lg.top()] < arr[i]) lg.pop();
    if(lg.size() > 0){
      ml[i] = lg.top();
    }
    lg.push(i);
  }
  stack<int> rg;
  for(int i = n;i >= 1;i--){
    while(rg.size() > 0 && arr[rg.top()] < arr[i]) rg.pop();
    if(rg.size() > 0){
      mr[i] = rg.top();
    }
    rg.push(i);
  }
  for(int i = 1;i<=n;i++){
    best[i] = (arr[ml[i]] > arr[mr[i]] ? ml[i] : mr[i]);
  }
}

int minimum_jumps(int a,int b,int c,int d){
  a ++,b ++;
  c ++,d ++;
  int m2 = c;
  for(int i = c;i <= d;i ++){
    if(arr[i] > arr[m2]) m2 = i;
  }
  int m1 = MAXN + 1;
  for(int i = a;i <= b;i++){
    if(arr[i] > arr[m1] && arr[i] < arr[m2]) m1 = i;
  }
  if(m1 == MAXN + 1) return -1;
  int last = m1;
  int ans = 0;
  while(arr[last] < arr[best[last]] && arr[best[last]] < arr[m2]){
    if(last >= c && last <= d) return ans;
    last = best[last];
    assert(last < d);
    ans ++;
  }
  while(!(last >= c && last <= d)){
    if(arr[last] > arr[m2] || last > d) return -1;
    last = mr[last];
    ans ++;
  }
  return ans;
}

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