Submission #138176

#	Time	Username	Problem	Language	Result	Execution time	Memory
138176		MrBrionix	Rice Hub (IOI11_ricehub)	C++14	100 / 100	21 ms	4216 KiB

ricehub

#include "ricehub.h"
#include <stdio.h>
#include <stdlib.h>
#include<bits/stdc++.h>
using namespace std;
/*
#define MAX_R  1000000

static int R, L;
static long long B;
static int X[MAX_R];
static int solution;

inline 
void my_assert(int e) {if (!e) abort();}

static void read_input()
{
  int i;
  my_assert(3==scanf("%d %d %lld",&R,&L,&B));
  for(i=0; i<R; i++)
    my_assert(1==scanf("%d",&X[i]));
  //my_assert(1==scanf("%d",&solution));
}
*/

int low,up,mid;
long long sum,pre[100005],suff[100005],v[100005],pos;
bool ok;

int besthub(int R, int L, int X[], long long B)
{
    
    for(int i=1;i<=R;i++){
        v[i]=X[i-1];
    }
    
    for(int i=1;i<=R;i++){
        pre[i]=pre[i-1]+v[i];
    }
    
    for(int i=R;i>=1;i--){
        suff[i]=suff[i+1]+(L-v[i]);
    }
    
    low=0;
    up=R+1;
    
    while(up-low>1){
        mid=(up+low)/2;
        ok=false;
        
        
        for(int i=mid;i<=R;i++){
            
            pos=(i+(i-mid+1))/2;
            sum=suff[i-mid+1]-suff[pos]-(L-v[pos])*(pos-(i-mid+1));
            sum+=pre[i]-pre[pos]-v[pos]*(i-pos);
            
            if(sum<=B){
                ok=true;
                break;
            }
        }
        
        if(ok)low=mid;
        else up=mid;
        
    }
      
  return low;
}
/*
int main()
{
  int ans;
  read_input();
  ans = besthub(R,L,X,B);
  
  cout<<ans<<endl;
  
  if(ans==solution)
    printf("Correct.\n");
  else
    printf("Incorrect.  Returned %d instead of %d.\n",ans,solution);

  return 0;
}*/

• Subtask 1: 17 / 17
• Subtask 2: 25 / 25
• Subtask 3: 26 / 26
• Subtask 4: 32 / 32