Submission #1236666

#	Time	Username	Problem	Language	Result	Execution time	Memory
1236666		fauntleroy	Rice Hub (IOI11_ricehub)	C++20	0 / 100	0 ms	324 KiB

ricehub

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

int besthub(int R, int L, int x[], ll B) {
    int n = R;
    vector<ll> d(n - 1);
    for (int i = 0; i < n - 1; ++i)
        d[i] = x[i + 1] - x[i];
    vector<ll> pref(n - 1, 0);
    pref[0] = d[0];
    for (int i = 1; i < n - 1; ++i)
        pref[i] = pref[i - 1] + d[i];

    int l = 0, r = n;
    int ans = 0;
    while (l <= r) {
        int k = (l + r) >> 1;
        --k;    
        if (k == 0) {
            ans = max(ans, 1);
            l = 2;
            continue;
        }
        int l1 = 0, r1 = n - k - 1;
        ll mn = 1e9;
        
        for (int i = 0; i < n - k; ++i) {
            ll s = pref[i + k - 1] - (i > 0 ? pref[i - 1] : 0);
            if (s < mn) {
                l1 = i, r1 = i + k - 1;
                mn = s;
            }
        }
        //cout << l1 << ' ' << r1 << ' ' << " " << ' ' << k << '\n';
        int pos = (l1 > 0 ? pref[l1 - 1] : 0) + 1 + mn / 2;
        ll d = 0;
        for (int i = l1; i <= r1 + 1; ++i)
            d += abs(pos - x[i]);
        //cout << pos<<' '<<d << '\n';
        ++k;
        if (d > B)
            r = k - 1;
        else
            l = k + 1, ans = max(ans, k);
    }
    return ans;
}

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