Submission #708897

#	Time	Username	Problem	Language	Result	Execution time	Memory
708897		sofija6	Rice Hub (IOI11_ricehub)	C++14	100 / 100	23 ms	3276 KiB

ricehub

#include <bits/stdc++.h>
#define ll long long
#define MAXR 100010
using namespace std;
ll pref[MAXR],a[MAXR];
ll Calc(ll L,ll R,ll pos)
{
    ll l=L,r=R,mid,p;
    while (l<=r)
    {
        mid=(l+r)/2;
        if (a[mid]<=pos)
        {
            p=mid;
            l=mid+1;
        }
        else
            r=mid-1;
    }
    return pos*(p-L+1)-(pref[p]-pref[L-1])+pref[R]-pref[p]-pos*(R-p);
}
ll Check(ll x,ll n)
{
    ll ans=LLONG_MAX;
    for (ll i=1;i<=n-x+1;i++)
        ans=min(ans,Calc(i,i+x-1,a[(2*i+x)/2]));
    return ans;
}
int besthub(int R,int L,int X[],ll B)
{
    for (ll i=0;i<R;i++)
    {
        pref[i+1]=pref[i]+X[i];
        a[i+1]=X[i];
    }
    int l=1,r=R,mid,ans;
    while (l<=r)
    {
        mid=(l+r)/2;
        if (Check(mid,R)<=B)
        {
            ans=mid;
            l=mid+1;
        }
        else
            r=mid-1;
    }
    return ans;
}

Compilation message (stderr)

ricehub.cpp: In function 'long long int Calc(long long int, long long int, long long int)':
ricehub.cpp:20:31: warning: 'p' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |     return pos*(p-L+1)-(pref[p]-pref[L-1])+pref[R]-pref[p]-pos*(R-p);
      |                         ~~~~~~^
ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:48:12: warning: 'ans' may be used uninitialized in this function [-Wmaybe-uninitialized]
   48 |     return ans;
      |            ^~~

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