Submission #302415

#	Time	Username	Problem	Language	Result	Execution time	Memory
302415		UserIsUndefined	Rice Hub (IOI11_ricehub)	C++14	17 / 100	20 ms	1664 KiB

ricehub

#include "ricehub.h"
#include <bits/stdc++.h>

using namespace std;


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

    int low = 0;

    int high = R*2;


    while(low < high){
        int mid = (high+low)/2;

//        cout << mid << " " << low << " " << high << endl;


        long long sum = 0;

        long long now = X[mid/2];

        long long pluss = mid - mid/2 - 1;

        long long mines = mid - (pluss + 1);


//        cout << "lenth " << mid << endl;
//        cout << now << " << now " << pluss << " << pluse " << mines << " << mines " << endl;


        for (int i = 0 ; i < mid ; i++){
            sum+= llabs(now - X[i]);
        }

//        cout << "first sum " << sum << endl;
//        cout << "B" << B << endl;

        if (sum <= B){

            low = mid + 1;
            continue;
        }

        int good = false;


        for (int i = mid/2 + 1 ; i + pluss < R ; i++){
            int bye = X[i - mines - 1];
//            cout << "bye " << bye << endl;
            sum-= llabs(X[i-1] - bye);
//            cout << "sum without bye " << sum << endl;
            int hello = X[i + pluss];
//            cout << "hello " << hello << endl;
            sum+= llabs(X[i] - hello);
//            cout << "sum with hello " << sum << endl;

            sum+= llabs(X[i] - X[i-1])*(mines - 1);

//            cout << "sum with pre" << sum << endl;

            sum-= llabs(X[i] - X[i-1])*(pluss - 1);

//            cout << "sum without after" << sum << endl;

//            cout << "new sum " << sum << endl;

            if (sum <= B){
                low = mid + 1;
                good = true;
                break;
            }

        }

        if (good)continue;

        high = mid - 1;






    }

    int best = low - 1;




//    for (int i = max(low - 5, 0) ; i <= min(low + 5, R) ; i++){
//        long long sum = 0;
//
//        long long now = X[i/2];
//
//        long long pluss = i - i/2 - 1;
//
//        long long mines = i - pluss + 1;
//
//        cout << "for " << i << endl;
//
//        cout << "sums are :\n";
//
//
//        for (int j = 0 ; j < i ; j++){
//            sum+= llabs(now - X[j]);
//        }
//
//        cout << sum << endl;
//
//        if (sum <= B){
//            best = i;
//            continue;
//        }
//
//        int good = false;
//
//
//        for (int j = now + 1 ; j + pluss - 1 < R ; j++){
//            int bye = X[j - mines];
//            sum-= llabs(X[j-1] - bye);
//            int hello = X[j + pluss];
//            sum+= llabs(X[j] - hello);
//
//            sum+= llabs(X[j] - X[j-1])*mines;
//
//            sum-= llabs(X[j] - X[j-1])*(pluss - 1);
//
//             cout << sum << endl;
//
//            if (sum <= B){
//                best = i;
//                good = true;
//                break;
//            }
//
//        }
//
//        if (good)continue;
//    }



    return best;
}

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