Submission #1018792

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018792		Boas	Counting Mushrooms (IOI20_mushrooms)	C++17	25 / 100	73 ms	1008 KiB

mushrooms

#include <bits/stdc++.h>
using namespace std;
#include "mushrooms.h"
 
#define loop(x, i) for (int i = 0; i < x; i++)
#define pb push_back
#define ALL(x) (x).begin(), (x).end()
typedef vector<int> vi;
typedef pair<int, int> ii;
typedef set<int> si;
typedef vector<vi> vvi;
 
int count_mushrooms(int n)
{
	vi A = {0}, B;
	int c1 = use_machine({0, 1});
	int i = 2;
	if (c1 == 1)
	{
		if (n == 2)
			return 1;
		B.pb(1);
		int c2 = use_machine({1, 2});
		i++;
		if (c2 == 1)
			A.pb(2);
		else
			B.pb(2);
	}
	else
	{
		A.pb(1);
	}
    int x = 141;
	while (min(A.size(), B.size()) < x)
	{
		if (A.size() >= 2)
		{
				if (i + 1 >= n)
					break;
				int res = use_machine({A[0], i, A[1], i + 1});
				if (res == 0)
				{
					A.pb(i);
					A.pb(i + 1);
				}
				else if (res == 1)
				{
					A.pb(i);
				}
				else if (res == 2)
				{
					A.pb(i + 1);
				}
				i += 2;
		}
		else
		{
				if (i + 1 >= n)
					break;
				int res = use_machine({B[0], i, B[1], i + 1});
				if (res == 3)
				{
					A.pb(i);
					A.pb(i + 1);
				}
				else if (res == 2)
				{
					A.pb(i);
				}
				else if (res == 1)
				{
					A.pb(i + 1);
				}
				i += 2;
		}
	}
	if (i == n - 1)
	{
		if (use_machine({0, i}) == 0)
			A.pb(i);
        i++;
	}
    int res = A.size();
    for (; i < n; i += x)
    {
        vi q;
        if (A.size() >= x)
        {
            q.pb(A[0]);
            int l = min(x, n - 1 - i);
            loop(l, j)
            {
                q.pb(i + j);
                q.pb(A[j + 1]);
            }
            res += (l - use_machine(q) / 2);
            q.clear();
        }
        else
        {
            q.pb(B[0]);
            int l = min(x, n - 1 - i);
            loop(l, j)
            {
                q.pb(i + j);
                q.pb(B[j + 1]);
            }
            res += use_machine(q) / 2;
            q.clear();
        }
    }
	return res;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:35:33: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   35 |  while (min(A.size(), B.size()) < x)
      |         ~~~~~~~~~~~~~~~~~~~~~~~~^~~
mushrooms.cpp:88:22: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   88 |         if (A.size() >= x)
      |             ~~~~~~~~~^~~~

• Subtask 1: 25 / 100