Submission #248619

#	Time	Username	Problem	Language	Result	Execution time	Memory
248619		davi_bart	Dancing Elephants (IOI11_elephants)	C++14	26 / 100	9002 ms	2756 KiB

elephants

#pragma GCC optimize("O3")
#include <bits/stdc++.h>
#include "elephants.h"
using namespace std;
typedef long long ll;
//#define int ll
mt19937 rng(chrono::steady_clock::now().time_since_epoch().count());
int n;
vector<int> v(200010);
vector<int> p(200010);
int dim;
void init(int N, int L, int X[]){
  n=N;
  v.resize(N);
  p.resize(N);
  for(int i=0;i<N;i++){
      p[i]=v[i]=X[i];
  }
  dim=L;
}
int update(int i,int y){
  p.erase(lower_bound(p.begin(),p.end(),v[i]));
  p.insert(upper_bound(p.begin(),p.end(),y),y);
  v[i]=y;
  int pos=p[0];
  int tot=1;
  for(int i=0;i<n;i++){
    if(p[i]-pos>dim){
      tot++;
      pos=p[i];
    }
    int d=1;
    while(i<n-1){
      d=min(d,n-i-1);
      if(p[i+d]-pos<=dim){
        i+=d;
        d*=2;
      }else break;
    }
  }
  return tot;
  if(dim>1000000){
    while(1){
      int w=upper_bound(p.begin(),p.end(),pos+dim)-p.begin();
      if(w==p.size())break;
      tot++;
      pos=p[w];
    }
  }else{
    for(int x:p){
      if(x-pos<=dim)continue;
      tot++;
      pos=x;
    }
  }
  return tot;
}

Compilation message (stderr)

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:45:11: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       if(w==p.size())break;
          ~^~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 16 / 16
• Subtask 3: 0 / 24
• Subtask 4: 0 / 47
• Subtask 5: 0 / 3