Submission #880723

#	Time	Username	Problem	Language	Result	Execution time	Memory
880723		andro	Rice Hub (IOI11_ricehub)	C++14	0 / 100	446 ms	1372 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
//#define int long long
using namespace std;
int besthub(int R, int L, int X[], long long B){
    long long pref[R+1];
    pref[0]=0;
    for(int i=1;i<=R;i++)pref[i]=pref[i-1]+X[i];
    int ans=0;
    map<int,int>cnt;
    for(int i=1;i<=R;i++)cnt[X[i]]++;
    for(int i=1;i<=R;i++){
        long long LL=0LL,RR=(long long)1e15,P=0;
        while(LL<=RR){
            long long s=(LL+RR)/2;
            long long c=0;
            /*
            for(int j=1;j<=R;j++){
                if(X[j]>=X[i]&&X[j]<=X[i]+s){
                    c+=X[j]-X[i];
                }
                else if(X[j]<=X[i]&&X[j]>=X[i]-s&&X[j]<=X[i]){
                    c+=X[i]-X[j];
                }
            }*/
            int l=1,r=i,p=-1;
            while(l<=r){
                int mid=(l+r)/2;
                if(abs(X[mid]-X[i])<=s){
                    r=mid-1;
                    p=mid;
                }
                else {
                    l=mid+1;
                }
            }
            int x=i-p+1;
            c+=X[i]*x-(pref[i]-pref[p-1]);
            l=i+1,r=R,p=-1;
            while(l<=r){
                int mid=(l+r)/2;
                if(abs(X[i]-X[mid])<=s){
                    l=mid+1;
                    p=mid;
                }
                else {
                    r=mid-1;
                }
            }
            if(p!=-1){
                x=p-i;
                c+=(pref[p]-pref[i])-X[i]*x;
            }
            if(c<=B){
                LL=s+1;
                P=s;
            }
            else {
                RR=s-1;
            }
            //cout<<i<<" "<<s<<" "<<c;
            //cout<<endl;
        }
        int u=0;
        long long s=0;
        for(int j=i-1;j>=1;j--){
            if(abs(X[i]-X[j])>P)break;
            u++;
            s+=X[i]-X[j];
        }
        for(int j=i;j<=R;j++){
            if(abs(X[i]-X[j])>P)break;
            u++;
            s+=X[j]-X[i];
        }
        /*
        int l=1,r=i,p=-1;
        while(l<=r){
            int mid=(l+r)/2;
            if(X[i]-X[mid]<=P){
                r=mid-1;
                p=mid;
            }
            else {
                l=mid+1;
            }
        }
        //s+=((i-p+1)*X[i])-(pref[i]-pref[p-1]);
        u+=i-p+1;
        l=i+1,r=R,p=-1;
        while(l<=r){
            int mid=(l+r)/2;
            if(X[mid]-X[i]<=P){
                l=mid+1;
                p=mid;
            }
            else {
                r=mid-1;
            }
        }
        if(p!=-1){
            u+=p-i;
            //s+=(pref[p]-pref[i])-(X[i]*(p-i));
        }
        for(int j=1;j<=R;j++){
            if(abs(X[i]-X[j])<=P)s+=abs(X[i]-X[j]);
        }*/
        // |x-y|=P
        //! kolko ih ima na intervalu [a[i],a[i]+mid]+[a[i]-mid,a[i]]
        for(int j=1;j<=R;j++){
            if(abs(X[j]-X[i])==P+1){
                s+=abs(X[j]-X[i]);
                if(s<=B)u++;
            }
        }
        //cout<<i<<" "<<u<<" "<<s;
        //cout<<endl;
        ans=max(ans,u);
    }
    return ans;
}/*
signed main(){
    int X[4]={0,10,12,14};
    cout<<besthub(3,14,X,6);
}*/
/*
1 3 6
2 3 4
3 3 6
3
*/

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