Submission #422234

#	Time	Username	Problem	Language	Result	Execution time	Memory
422234		ScarletS	Rice Hub (IOI11_ricehub)	C++17	0 / 100	19 ms	1756 KiB

ricehub

#include <bits/stdc++.h>
using namespace std;

int besthub(int R, int L, int a[], long long B)
{
    int l=0,r=R,m,x,y;
    bool ok;
    //cout<<L<<"!!\n";
    long long cur;
    while (l<r)
    {
        ok=0;
        m=l+(r-l)/2+1;
        //cout<<m<<"!\n";
        cur=0;
        x=0;y=m-1;
        for (int i=0;i<=y/2;++i)
            cur-=a[i];
        for (int i=y/2+1;i<m;++i)
            cur+=a[i];
        // cout<<cur<<"\n";
        // cout<<1LL*a[(x+y)/2]*((m-1)/2+1)<<" "<<-1LL*a[(x+y)/2]*(m-(m-1)/2-1)<<"\n";
        //cout<<cur+1LL*a[(x+y)/2]*((m-1)/2+1)-1LL*a[(x+y)/2]*(m-(m-1)/2-1)<<" ";
        if (cur+1LL*a[(x+y)/2]*((m-1)/2+1)-1LL*a[(x+y)/2]*(m-(m-1)/2-1)<=B)
            ok=1;
        for (;y<R;++x,++y)
        {
            cur+=a[x-1];
            cur+=a[y];
            cur-=a[(x+y)/2]*2;
            if (cur+1LL*a[(x+y)/2]*((m-1)/2+1)-1LL*a[(x+y)/2]*(m-(m-1)/2-1)<=B)
                ok=1;
            //cout<<cur+1LL*a[(x+y)/2]*((m-1)/2+1)-1LL*a[(x+y)/2]*(m-(m-1)/2-1)<<" ";
        }
        //cout<<"\n";
        if (ok)
            l=m;
        else
            r=m-1;
    }
    return l;
}

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