Submission #435482

#	Time	Username	Problem	Language	Result	Execution time	Memory
435482		Collypso	Counting Mushrooms (IOI20_mushrooms)	C++17	Compilation error	0 ms	0 KiB

mushrooms

#include <bits/stdc++.h>
#define ll long long
#define ld long double
#define pii pair<int, int>
#define pll pair<ll, ll>
#define vt vector
#define pb push_back
#define all(x) (x).begin(), (x).end()
#define sz(x) (int) (x).size()
#pragma GCC optimize ("O3")
#pragma GCC optimize ("O2")
#define F first
#define S second
//#define endl '\n'
//#define int long long

using namespace std;

int use_machine(vt<int> x);

int subtask1(int n)
{
	int ans = 1;
    for(int i = 1; i < n - 1; i += 2)
    {
        int tmp = use_machine({i + 1, 0, i});
        if (tmp == 0) ans += 2;
        else if (tmp == 1) ans += 1;
    }
    if (n % 2 == 0) ans += !use_machine({0, n - 1});
    return ans;
}

int count_mushrooms(int n)
{
    if (n <= 452) return subtask1(n);

    for(int i = 0; i < n; i++) group[i] = i;
    merge_group(0, n - 1);
    int sum = 1;
    for(int i = 1, cur = 1; i < n; i++)
    {
        if (group[i] != i - 1) cur = !cur;
        sum += cur;
    }
    //for(int i = 0; i < n; i++) cout << group[i] << " ";
    //cout << endl;
    return sum;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:38:32: error: 'group' was not declared in this scope
   38 |     for(int i = 0; i < n; i++) group[i] = i;
      |                                ^~~~~
mushrooms.cpp:39:5: error: 'merge_group' was not declared in this scope
   39 |     merge_group(0, n - 1);
      |     ^~~~~~~~~~~
mushrooms.cpp:43:13: error: 'group' was not declared in this scope
   43 |         if (group[i] != i - 1) cur = !cur;
      |             ^~~~~