Submission #699791

#	Time	Username	Problem	Language	Result	Execution time	Memory
699791		grossly_overconfident	Counting Mushrooms (IOI20_mushrooms)	C++14	Compilation error	0 ms	0 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;

int count_mushrooms(int n) {
	if (n < 220){
		int a = 1;
		for (int i = 1; i < n; ++i){
			a += 1 - use_machine({ 0, i });
		}
		return a;
	}
	vector<int> a(1, 0);
	vector<int> b;
	if (use_machine({ 0, 1 }) == 1){
		b.push_back(1);
	}
	else{
		a.push_back(1);
	}
	if (use_machine({ 0, 2 }) == 1){
		b.push_back(2);
	}
	else{
		a.push_back(2);
	}
	for (int i = 3; i <= 150; i += 2){
		if (a.size() > b.size()){
			int h = use_machine({ i, a[0], i + 1, a[1]});
			if (h % 2){
				a.push_back(i);
			}
			else{
				b.push_back(i);
			}
			if (h < 2){
				a.push_back(i + 1);
			}
			else{
				b.push_back(i + 1);
			}
		}
		else{
			int h = use_machine({ i, b[0], i + 1, b[1]});
			if (h % 2){
				b.push_back(i);
			}
			else{
				a.push_back(i);
			}
			if (h < 2){
				b.push_back(i + 1);
			}
			else{
				a.push_back(i + 1);
			}
		}
	}
	int i = 151;
	int tally = a.size();
	while (true){
		if (a.size() < b.size()){
			vector<int> p;
			int w = i;
			for (int j = 0; j < b.size(); ++j){
				p.push_back(i);
				p.push_back(b[j]);
				i++;
				if (i == n){
					break;
				}
			}
			int h = use_machine(p);
			if (h % 2 == 0){
				b.push_back(w);
				tally += h / 2;

			}
			else{
				a.push_back(w);
				tally++;
				tally += (h - 1) / 2;
			}
			if (i == n){
				return tally;
			}
		}
		else{
			vector<int> p;
			int w = i;
			for (int j = 0; j < a.size(); ++j){
				p.push_back(i);
				p.push_back(a[j]);
				i++;
				if (i == n){
					break;
				}
			}
			h = use_machine(p);
			if (h % 2 == 0){
				a.push_back(w);
				tally++;
				tally += (i - w) - (h / 2);

			}
			else{
				b.push_back(w);
				tally += (i - w) - ((h - 1) / 2);
			}
			if (i == n){
				return tally;
			}
		}
		if (i == n){
			return tally;
		}
	}
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:65:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   65 |    for (int j = 0; j < b.size(); ++j){
      |                    ~~^~~~~~~~~~
mushrooms.cpp:91:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   91 |    for (int j = 0; j < a.size(); ++j){
      |                    ~~^~~~~~~~~~
mushrooms.cpp:99:4: error: 'h' was not declared in this scope
   99 |    h = use_machine(p);
      |    ^