Submission #1003186

#	Time	Username	Problem	Language	Result	Execution time	Memory
1003186		vjudge1	Rice Hub (IOI11_ricehub)	C++17	0 / 100	2 ms	604 KiB

ricehub

#include <bits/stdc++.h>
using namespace std;
#define ll long long
#define f first
#define s second
#define pf push_front
#define pb push_back
#define pi pair<int,int>
#define vi vector<int>

/*
int besthub(int n, int last, int x[], ll b){
    

    int ans = 0;
    int l , r;
    for(int i = 0; i < n; i++){
        
        l = i - (lower_bound(x.begin(), x.end(), max(0LL,x[i]-b))- x.begin());
        r =  upper_bound(x.begin(), x.end(), min((ll) last, x[i]+b)) - x.begin() - (i+1);
       // cout << x[i] << " " <<l << " " << r << endl;
        ans = max(l+r+1,ans);
    }
    
    return ans;

}

*/

int besthub(int n, int last, int x[], ll b){
    

    ll ans = 0;
    
    ll cnt;
    ll pref[n];
    pref[0] = 0;
    for(int i = 1; i  < n; i++){
        pref[i] = pref[i-1] + (x[i]-x[i-1]);
    }
    /*
    for(int i : pref){
        cout << i << " ";
    }
    cout << endl;
    */
    
    ll l = 0;
    ll final = 1;
    
    for(int r =0; r < n;r++){
        int m = (l+r+1)/2;
       // cout <<  m<<" d "<<(pref[m]-pref[l]) <<" "  << pref[r]-pref[m]<<endl;
        ll val = pref[r] - pref[max(0,m-1)] + (pref[m]-pref[l]);
           //    cout << val <<" "<<l <<" "<<r<< endl;

        if( pref[r] - pref[max(0,m-1)] + (pref[m]-pref[l])<= b){
           // cout << l << " " << r << endl;
            final = max(final,r-l+1);
        }
        else{
            while( pref[r] - pref[max(0,m-1)] + (pref[m]-pref[l]) > b && l<r){
                l++;
            }
            if( pref[r] - pref[max(0,m-1)] + (pref[m]-pref[l])<= b){
                 final = max(final,r-l+1);
            }
            
        }
    }
    
    return final;

}

Compilation message (stderr)

ricehub.cpp: In function 'int besthub(int, int, int*, long long int)':
ricehub.cpp:55:12: warning: unused variable 'val' [-Wunused-variable]
   55 |         ll val = pref[r] - pref[max(0,m-1)] + (pref[m]-pref[l]);
      |            ^~~
ricehub.cpp:34:8: warning: unused variable 'ans' [-Wunused-variable]
   34 |     ll ans = 0;
      |        ^~~
ricehub.cpp:36:8: warning: unused variable 'cnt' [-Wunused-variable]
   36 |     ll cnt;
      |        ^~~

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