Submission #551871

#	Time	Username	Problem	Language	Result	Execution time	Memory
551871		ala2	Rice Hub (IOI11_ricehub)	C++14	0 / 100	3 ms	724 KiB

ricehub

#include "ricehub.h"
#include <iostream>
using namespace std;
int n,d;
int a[1000100];
int b;
int P[1001000];
int suf[1000100];
int f(int i,int j)
{
    int x=(i+j)/2;
    x=a[x];
    int g=0;
    for(int o=i; o<=j; o++)
        g+=abs(a[o]-x);
    return g;
}
int ok(int mid)
{
    int x=f(0,mid);
    int cur=a[mid/2];
    int old=a[mid/2];
    int mn=x;
    int l=a[0];
    int r=a[mid];
    for(int i=1;i<n-mid;i++)
    {
        cur=a[(i+i+mid)/2];
        int g=x;
        g-=old-l;
        g+=P[ (i+i+mid)/2 ]-P[ (i-1+i-1+mid)/2 ]-1;
        g+=a[i+mid]-cur;
        g-= suf[ (i+i+mid)/2 ] - suf[ i+mid ]-1 ;
        mn=min(mn,g);
        old=cur;
        l=a[i];
        r=a[i+mid];
        x=g;
    }
    return mn<=b;
}
int besthub(int R, int L, int X[], long long B)
{
    n=R;
    d=L;
    b=B;
    for(int i=0; i<n; i++)
        a[i]=X[i];
    int mx=1;
    P[0]=1;
    for(int i=0;i<n;i++)
    {
        if(i)
            P[i]=1+P[i-1];
    }
    suf[n-1]=1;
    for(int i=n-2;i>=0;i--)
    {
        suf[i]=1+suf[i+1];
    }
    int l=0;
    int r=n;
    while(r-l>1)
    {
        int mid=(l+r)/2;
        if(ok(mid))
        {
            l=mid;
        }
        else
            r=mid;
    }

    int ann=l+1;
    //cout<<mx<<endl;
    return ann;
}

Compilation message (stderr)

ricehub.cpp: In function 'int ok(int)':
ricehub.cpp:25:9: warning: variable 'r' set but not used [-Wunused-but-set-variable]
   25 |     int r=a[mid];
      |         ^
ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:49:9: warning: unused variable 'mx' [-Wunused-variable]
   49 |     int mx=1;
      |         ^~

• Subtask 1: 0 / 17
• Subtask 2: 0 / 25
• Subtask 3: 0 / 26
• Subtask 4: 0 / 32