Submission #1018812

#	Time	Username	Problem	Language	Result	Execution time	Memory
1018812		j_vdd16	Counting Mushrooms (IOI20_mushrooms)	C++17	52.68 / 100	8 ms	600 KiB

mushrooms

#include "mushrooms.h"

#include <algorithm>
#include <bitset>
#include <cstdint>
#include <cstring>
#include <iostream>
#include <limits.h>
#include <math.h>
#include <map>
#include <numeric>
#include <queue>
#include <set>
#include <stack>
#include <string>
#include <vector>

//#define int long long
#define loop(X, N) for(int X = 0; X < (N); X++)
#define all(V) V.begin(), V.end()
#define rall(V) V.rbegin(), V.rend()

using namespace std;

typedef vector<int> vi;
typedef vector<vi> vvi;
typedef pair<int, int> ii;
typedef vector<ii> vii;
typedef vector<vector<ii>> vvii;
typedef vector<bool> vb;
typedef vector<vector<bool>> vvb;

//int use_machine(vi x);

int count_mushrooms(int n)
{
	vi a = { 0 };
	vi b;

	int i = 1;
	for (; i < n; i++)
	{
		int res = use_machine({ 0, i });
		if (res == 0)
			a.push_back(i);
		else
			b.push_back(i);

		if (a.size() * a.size() >= n)
			break;

		if (b.size() * b.size() >= n)
			break;
	}
	i++;

	int result = a.size();
	if (a.size() > b.size())
	{
		int sq = a.size() - 1;
		while (i < n)
		{
			vi ask;
			int asked = min(sq, n - i);
			loop(j, asked)
			{
				ask.push_back(a[j]);
				ask.push_back(i++);
			}
			ask.push_back(a.back());

			int res = use_machine(ask);
			result += asked - res / 2;
		}
	}
	else
	{
		int sq = b.size() - 1;
		while (i < n)
		{
			vi ask;
			loop(j, min(sq, n - i))
			{
				ask.push_back(b[j]);
				ask.push_back(i++);
			}
			ask.push_back(b.back());

			int res = use_machine(ask);
			result += res / 2;
		}
	}

	return result;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:49:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   49 |   if (a.size() * a.size() >= n)
      |       ~~~~~~~~~~~~~~~~~~~~^~~~
mushrooms.cpp:52:27: warning: comparison of integer expressions of different signedness: 'std::vector<int>::size_type' {aka 'long unsigned int'} and 'int' [-Wsign-compare]
   52 |   if (b.size() * b.size() >= n)
      |       ~~~~~~~~~~~~~~~~~~~~^~~~

• Subtask 1: 52.6807 / 100