Submission #1055597

#	Time	Username	Problem	Language	Result	Execution time	Memory
1055597		Trent	Counting Mushrooms (IOI20_mushrooms)	C++17	53.43 / 100	10 ms	1376 KiB

mushrooms

#include "mushrooms.h"
#include "bits/stdc++.h"
using namespace std;
#define forR(i, x) for(int i = 0; i < (x); ++i)
#define REP(i, a, b) for(int i = (a); i < (b); ++i)
#define all(x) x.begin(), x.end()
typedef vector<int> vi;
typedef vector<bool> vb;
typedef long long ll;
typedef vector<ll> vll;
typedef set<int> si;

int count_mushrooms(int n) {
	int IVL = n <= 200 ? 1 : 140;
	vi chk;
	for(int i = 0; i < n; i += IVL) chk.push_back(i);
	if(chk.back() < n-1) chk.push_back(n-1);
	vi ty(chk.size());
	ty[0] = 0;
	REP(i, 1, chk.size()) {
		vi tst = {0, chk[i]};
		ty[i] = use_machine(tst) == 0 ? 0 : 1;
	}

	vi ac, bc;
	forR(i, chk.size()) {
		if(ty[i] == 0) ac.push_back(chk[i]);
		else bc.push_back(chk[i]);
	}
	vb usd(n, false);
	for(int i : chk) usd[i] = true;
	si emp;
	forR(i, n) if(!usd[i]) emp.insert(i);

	int tot = ac.size();
	while(!emp.empty()) {
		int amt = min(max(ac.size(), bc.size()), emp.size() + 1);
		if(ac.size() > bc.size()) {
			vi qu;
			forR(i, amt - 1) {
				qu.push_back(ac[i]);
				qu.push_back(*emp.begin());
				emp.erase(qu.back());
			}
			qu.push_back(ac[amt - 1]);
			int ret = use_machine(qu);
			cerr << qu.size() << ' ' << ret << '\n';
			tot += amt - 1 - ret / 2;
		} else {
			vi qu;
			forR(i, amt - 1) {
				qu.push_back(bc[i]);
				qu.push_back(*emp.begin());
				emp.erase(qu.back());
			}
			qu.push_back(bc[amt - 1]);
			int ret = use_machine(qu);
			cerr << qu.size() << ' ' << ret << '\n';
			tot += ret / 2;
		}
	}
	return tot;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:5:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    5 | #define REP(i, a, b) for(int i = (a); i < (b); ++i)
      |                                         ^
mushrooms.cpp:20:2: note: in expansion of macro 'REP'
   20 |  REP(i, 1, chk.size()) {
      |  ^~~
mushrooms.cpp:4:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define forR(i, x) for(int i = 0; i < (x); ++i)
      |                                     ^
mushrooms.cpp:26:2: note: in expansion of macro 'forR'
   26 |  forR(i, chk.size()) {
      |  ^~~~

• Subtask 1: 53.4279 / 100