Submission #824257

#	Time	Username	Problem	Language	Result	Execution time	Memory
824257		thimote75	Counting Mushrooms (IOI20_mushrooms)	C++14	56.36 / 100	9 ms	336 KiB

mushrooms

#include "mushrooms.h"

#include <bits/stdc++.h>

using namespace std;

using idata = vector<int>;

const int QK = 186;

int count_mushrooms(int n) {
	idata Av = { 0 };
	idata Bv = { };
	
	for (int i = 1; i < n && i < QK; i ++) {
		int res = use_machine({ 0, i });
		if (res == 0) Av.push_back(i);
		else Bv.push_back(i);
	}

	int offset     = 0;
	int multiplier = 1;
	
	if (Bv.size() > Av.size()) {
		Bv.swap(Av);
		offset = n;
		multiplier = -1;
	}

	int total = Av.size();

	for (int i = QK; i < n; i += Av.size() - 1) {
		idata templ;

		int cnt = 0;
		for (int j = 0; j < Av.size() - 1; j ++) {
			templ.push_back(Av[j]);

			if (i + j >= n) continue ;

			cnt ++;
			templ.push_back(i + j);
		}
		templ.push_back(Av[Av.size() - 1]);

		int res = use_machine(templ);

		int c0 = (cnt) - (res >> 1);
		total += c0;
	}

	return offset + multiplier * total;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:36:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   36 |   for (int j = 0; j < Av.size() - 1; j ++) {
      |                   ~~^~~~~~~~~~~~~~~

• Subtask 1: 56.3591 / 100