Submission #1005781

#	Time	Username	Problem	Language	Result	Execution time	Memory
1005781		thinknoexit	Counting Mushrooms (IOI20_mushrooms)	C++17	Compilation error	0 ms	0 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
using ll = long long;
int n;
int count_mushrooms(int N) {
	n = N;
	if (n <= 451) {
		int ans = 1;
		for (int i = 2;i < n;i += 2) {
			int v = use_machine({ i - 1, 0, i });
			if (v == 1) ans++;
			else if (v == 0) ans += 2;
		}
		if ((n - 1) & 1) {
			if (!use_machine({ 0, n - 1 })) ans++;
		}
		return ans;
	}
	vector<int> A, B;
	A.push_back(0);
	int p;
	for (p = 2;p < n && (int)A.size() < sq && (int)B.size() < sq;p += 2) {
		int v = use_machine({ p - 1, 0, p });
		if (v == 0) {
			A.push_back(p);
			A.push_back(p - 1);
		}
		else if (v == 2) {
			B.push_back(p);
			B.push_back(p - 1);
		}
		else {
			if (use_machine({ 0, p })) B.push_back(p), A.push_back(p - 1);
			else B.push_back(p - 1), A.push_back(p);
		}
	}
	p--;
	// count A from p -> n - 1
	int ans = A.size();
	if (A.size() > B.size()) {
		int sz = A.size();
		for (int i = p, j;i < n;i = j) {
			vector<int> Q;
			for (j = i;j < min(n, i + sz - 1);j++) {
				Q.push_back(j);
				Q.push_back(A[j - i]);
			}
			int v = use_machine(Q);
			int s = Q.size();
			ans += (s - v) / 2;
		}
	}
	else {
		int sz = B.size();
		for (int i = p, j;i < n;i = j) {
			vector<int> Q;
			for (j = i;j < min(n, i + sz - 1);j++) {
				Q.push_back(j);
				Q.push_back(B[j - i]);
			}
			int v = use_machine(Q);
			ans += (v + 1) / 2;
		}
	}
	return ans;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:23:38: error: 'sq' was not declared in this scope
   23 |  for (p = 2;p < n && (int)A.size() < sq && (int)B.size() < sq;p += 2) {
      |                                      ^~