Submission #316017

#	Time	Username	Problem	Language	Result	Execution time	Memory
316017		neizod	Counting Mushrooms (IOI20_mushrooms)	C++17	Compilation error	0 ms	0 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;


bool swapped = false;
bool conflict = false;
int i = 1;
int just_count_A = 0;
int just_count_B = 0;
vector<int> A = { 0 };
vector<int> B = { };


int calc_pivots_size(int n) {
        return 1.5 + (3*sqrt(n-2)/4);
}


void make_swap() {
        swapped = not swapped;
        swap(just_count_A, just_count_B);
        swap(A, B);
}


bool decide_swap() {
        if (A.size() < B.size()) {
                make_swap();
        }
        return true;
}


int handle_parity(int parity) {
        (parity == 0 ? A : B).push_back(i);
        return 1;
}


int handle_pair(int raw_info) {
        int flag2b = raw_info >> 1;
        if (flag2b & 0b01) {
        conflict = true;
        return 0;
        }
        (flab2b & 0b10 ? B : A).push_back(i);
        (flab2b & 0b10 ? B : A).push_back(i+1);
        return 2;
}


int handle_conflict_slow(int flag2b) {
    (flag2b & 0b01 ? A : B).push_back(i);
    (flag2b & 0b01 ? B : A).push_back(i+1);
    (flag2b & 0b10 ? B : A).push_back(i+2);
    conflict = false;
    return 3;
}


int handle_conflict_fast(int raw_info) {
        int flag3b = raw_info - 1;
        (flag3b & 0b100 ? A : B).push_back(i);
        (flag3b & 0b100 ? B : A).push_back(i+1);
        (flag3b & 0b010 ? B : A).push_back(i+2);
        (flag3b & 0b001 ? B : A).push_back(i+3);
    conflict = false;
        return 4;
}


void get_pivots(int n) {
        int info;
        int size = calc_pivots_size(n);
        while (decide_swap() and (int)A.size() < size and i+4 < n) {
        if (not conflict) {
            switch (A.size()) {
                case 1:
                    i += handle_parity(use_machine({ i, A[0] }));
                    break;
                case 2:
                    info = use_machine({ i, A[0], i+1, A[1] });
                    i += handle_parity(info%2);
                    i += handle_parity(info/2);
                    break;
                default:
                    info = use_machine({ i, A[0], i+1, A[1], i+2, A[2] });
                    i += handle_parity(info%2);
                    i += handle_pair(info);
            }
        } else if (B.size() < 2) {
            info = use_machine({ i+1, A[0], i+2, A[1] });
            i += handle_conflict_slow(info);
        } else {
            info = use_machine({ B[0], i, B[1], A[0], i+1, A[1], i+2, A[2], i+3 });
            i += handle_conflict_fast(info);
        }
        }
}


vector<int> make_sample(int size) {
        vector<int> sample = { };
        for (int j=0; j<size; j++) {
                sample.insert(sample.end(), { i+j, A[j] });
        }
        return sample;
}


void count_the_rest(int n) {
        while (decide_swap() and i < n) {
                int test_size = min((int)A.size(), n-i);
                int info = use_machine(make_sample(test_size));
                i += handle_parity(info%2);
                i += test_size-1;
                just_count_A += (test_size-1) - (info/2);
                just_count_B += info/2;
        }
}


int count_mushrooms(int n) {
        get_pivots(n);
        count_the_rest(n);
        if (swapped) {
                make_swap();
        }
        return A.size() + just_count_A;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int handle_pair(int)':
mushrooms.cpp:47:10: error: 'flab2b' was not declared in this scope; did you mean 'flag2b'?
   47 |         (flab2b & 0b10 ? B : A).push_back(i);
      |          ^~~~~~
      |          flag2b