Submission #969922

#	Time	Username	Problem	Language	Result	Execution time	Memory
969922		urieg	Rice Hub (IOI11_ricehub)	C++17	74 / 100	18 ms	4260 KiB

ricehub

#include <bits/stdc++.h>
#include "ricehub.h"
using namespace std;
typedef long long ll;
/// for moondance

int besthub(int R, int L, int X[], long long B){

    vector<ll>x(R), p(R);
    for(int i=0;i<R;i++){
        x[i] = X[i];
        p[i] = x[i];
        if(i)p[i] += p[i-1];
    }
    ll ans = 1;
    for(int i=0;i<R;i++){
        ll l = 1, r = R;
        while(l<r){
            ll m = (l+r+1)/2;
            ll l_ = i-m/2+(1-m%2), r_ = i+m/2;
            if(l_<0 || r_>=R){
                r = m-1;
                continue;
            }
            ll sum = p[r_] - p[i] - (x[i]*(r_-i));
            sum += x[i]*(i-l_+1) - (!l_ ? 0 : p[i]-p[l_-1]);

            if(m%2==0){
                l_ = i-m/2;r_=i+m/2-1;
                if(0<=l_&&r_<R){
                    ll sum2 = p[r_] - p[i] - (x[i]*(r_-i));
                    sum2 += x[i]*(i-l_+1) - (!l_ ? 0 : p[i]-p[l_-1]);
                    sum = min(sum, sum2);
                }
            }

            if(sum <= B)l = m;
            else r = m-1;
        }
        ans = max(ans, l);
    }
    return ans;
}

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