Submission #248590

#	Time	Username	Problem	Language	Result	Execution time	Memory
248590		davi_bart	Dancing Elephants (IOI11_elephants)	C++14	26 / 100	9085 ms	6008 KiB

elephants

#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);
set<int> k;
int dim;
vector<int>start;
void init(int N, int L, int X[]){
  n=N;
  for(int i=0;i<N;i++){
      v[i]=X[i];
      k.insert(X[i]);
  }
  dim=L;
  int pos=*k.begin();
  start.push_back(pos);
  for(int x:k){
    if(x-pos<=dim)continue;
    pos=x;
    start.push_back(pos);
  }
}
int zero(int i,int y){
  k.erase(v[i]);
  v[i]=y;
  k.insert(v[i]);
  start.clear();
  int pos=*k.begin();
  start.push_back(pos);
  for(int x:k){
    if(x-pos<=dim)continue;
    pos=x;
    start.push_back(pos);
  }
  return start.size();
}
int update(int i,int y){
  int q=min(v[i],y);
  int ini=lower_bound(start.begin(),start.end(),q)-start.begin();
  if(ini==0)return zero(i,y);
  while(start.size()>=ini)start.pop_back();
  ini--;
  k.erase(v[i]);
  v[i]=y;
  k.insert(v[i]);
  auto it=k.lower_bound(start[ini]);
  int pos=*it;
  start.push_back(pos);
  while(it!=k.end()){
    int x=*it;
    it++;
    if(x-pos<=dim)continue;
    pos=x;
    start.push_back(x);
  }
  /*cout<<"start: ";
  for(int i=0;i<start.size();i++)cout<<start[i]<<" ";
  cout<<endl;*/
  return start.size();
}

Compilation message (stderr)

elephants.cpp: In function 'int update(int, int)':
elephants.cpp:45:21: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(start.size()>=ini)start.pop_back();
         ~~~~~~~~~~~~^~~~~

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