Submission #781995

#	Time	Username	Problem	Language	Result	Execution time	Memory
781995		FEDIKUS	Radio Towers (IOI22_towers)	C++17	23 / 100	4069 ms	30016 KiB

towers

#include "towers.h"

#include <bits/stdc++.h>

using namespace std;

using mim = pair<pair<int,int>,int>;

const int maxn=1e5+10;
const int logg=18;

int n;
int h[maxn];
mim sparse[logg][maxn];

mim comb(mim &a,mim &b){
  mim ret=a;
  ret.first=max(ret.first,b.first);
  ret.second=min(ret.second,b.second);
  return ret;
}

void init(int _n, vector<int> _h) {
  n=_n;
  for(int i=0;i<n;i++) h[i]=_h[i];
  for(int i=0;i<logg;i++){
    for(int j=0;j<n;j++){
      if(i==0) sparse[i][j]={{h[j],j},h[j]};
      else if(j-(1<<(i-1))>=0) sparse[i][j]=comb(sparse[i-1][j],sparse[i-1][j-(1<<(i-1))]);
      else sparse[i][j]=sparse[i-1][j];
    }
  }
}

mim qry(int l,int r){
  mim ret={{h[l],l},h[l]};
  for(int i=logg-1;i>=0;i--){
    if(r-(1<<i)+1>=l){
      ret=comb(ret,sparse[i][r]);
      r-=(1<<i);
    }
  }
  return ret;
}

int resi(int l,int r,int d,int naj=1e9+10){
  if(r<l) return 0;
  auto temp=qry(l,r);
  pair<int,int> maxi=temp.first;
  int klk=temp.second<=naj;
  return max(resi(l,maxi.second-1,d,maxi.first-d)+resi(maxi.second+1,r,d,maxi.first-d),int(klk>0));
}

int max_towers(int l, int r, int d) {
  return resi(l,r,d);
}

• Subtask 1: 0 / 4
• Subtask 2: 11 / 11
• Subtask 3: 12 / 12
• Subtask 4: 0 / 14
• Subtask 5: 0 / 17
• Subtask 6: 0 / 19
• Subtask 7: 0 / 23