Submission #1124170

#	Time	Username	Problem	Language	Result	Execution time	Memory
1124170		njoop	Rice Hub (IOI11_ricehub)	C++17	100 / 100	12 ms	2376 KiB

ricehub

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

int n;
vector<ll> arr, pre;

ll cost(ll k) {
    ll mnco = 1e18;
    for(int i=k; i<=n; i++) {
        ll st = i-k+1, mid = st+(k+1)/2-1;
        ll left = (arr[mid]*(mid-st+1))-(pre[mid]-pre[st-1]);
        ll right = (pre[i]-pre[mid])-(arr[mid]*(i-mid));
        mnco = min(mnco, left+right);
    }
    return mnco;
}

int besthub(int R, int L, int X[], long long B) {
    n=R;
    arr.assign(R+10, 0);
    pre.assign(R+10, 0);
    for(int i=1; i<=R; i++) {
        arr[i] = X[i-1];
        pre[i] = pre[i-1] + arr[i];
    }
    ll l=1, r=R+1;
    while(l < r) {
        ll mid = (l+r)/2;
        if(cost(mid) > B) {
            r = mid;
        } else {
            l = mid+1;
        }
    }
    return l-1;
}

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