Submission #874732

#	Time	Username	Problem	Language	Result	Execution time	Memory
874732		StefanL2005	Rice Hub (IOI11_ricehub)	C++14	68 / 100	12 ms	4500 KiB

ricehub

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

int besthub(int R, int L, int V[], ll B)
{
    vector<int> X(R);
    vector<int> Best(R);
    for (int i = 0; i < R; i++)
        X[i] = V[i];

    int c1 = 0, c2 = 0;
    ll sum = 0;
    while (c2 < R && sum + X[c2] - X[0] <= B)
    {
        sum += X[c2] - X[0];
        c2++;
    }

    c2--;
    Best[0] = c2 + 1;

    for (int i = 1; i < R; i++)
    {
        if (X[i] == X[i - 1])
        {
            Best[i] = Best[i - 1];
            if (c2 < i)
                c2 = i;
            continue;
        }

        sum += (i - c1) * (X[i] - X[i - 1]) - (c2 - (i - 1)) * (X[i] - X[i - 1]);

        if (c2 < i)
            c2 = i;

        while (sum > B)
        {
            if (X[i] - X[c1] >= X[c2] - X[i])
            {
                sum -= X[i] - X[c1];
                c1++;
            }
            else
            {
                sum -= X[c2] - X[i];
                c2++;
            }
        } 

        bool done_changes = true;
        while (done_changes)
        {
            done_changes = false;
            int p1 = c1 - 1, p2 = c2 + 1;

            if (p2 < R && (p1 < 0 || X[p2] - X[i] <= X[i] - X[p1]))
            {   
                if (sum + X[p2] - X[i] <= B)
                {
                    sum += X[p2] - X[i];
                    c2++;
                    done_changes = true;
                    continue;
                }
            }
            if (p1 >= 0 && (p2 >= R || X[i] - X[p1] < X[p2] - X[i]))
            {
                if (sum + X[i] - X[p1] <= B)
                {
                    sum += X[i] - X[p1];
                    c1--;
                    done_changes = true;
                    continue;
                }
            }
            if (p2 < R && X[p2] - X[i] < X[i] - X[c1])
            {
                sum -= X[i] - X[c1];
                sum += X[p2] - X[i];
                c1++;
                c2++;

                done_changes = true;
                continue;
            }

            if (p1 >= 0 && X[i] - X[p1] < X[c2] - X[i])
            {
                sum -= X[c2] - X[i];
                sum += X[i] - X[p1];
                c2--;
                c1--;

                done_changes = true;
                continue;
            }
        }
        Best[i] = c2 - c1 + 1;
    }

    int Max = Best[0];
    for (int i = 0; i < R; i++)
        Max = max(Max, Best[i]);

    return Max;
}

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