Submission #424251

#	Time	Username	Problem	Language	Result	Execution time	Memory
424251		chirathnirodha	Counting Mushrooms (IOI20_mushrooms)	C++17	56.50 / 100	12 ms	328 KiB

mushrooms

//Coded by Chirath Nirodha
#include "mushrooms.h"
#include<bits/stdc++.h>
#define F first
#define S second
#define PB push_back
#define MP make_pair
#define P push
#define I insert
typedef long long ll;
typedef long double ld;
typedef unsigned long long ull;
using namespace std;
const ll mod=1e9+7;
int findbest(int n){
	pair<int,int> x;
	x.F=100000;
	for(int i=2;i<=1000;i++){
		int temp=i+(2*(n-i-1)+i)/(i+1);
		if(temp<x.F){
			x.F=temp;
			x.S=i;
		}
	}
	return x.S;
}
int count_mushrooms(int n) {
	vector<int> a,b;
	a.push_back(0);
  	int cur=1;
  	int bb=findbest(n);
  	if(n<=226)bb=n;
	while(cur<n && cur<bb){
		vector<int> m;
		m.PB(0);m.PB(cur);
		int x=use_machine(m);
		if(x==0)a.PB(cur);
		else b.PB(cur);
      	cur++;
	}
  	int ac=a.size(),bc=b.size();
	if(a.size()>=b.size()){
		while(cur<n){
			vector<int> m;
			for(int i=0;i<a.size();i++){
				m.PB(a[i]);
				if(cur==n || i==a.size()-1)break;
				m.PB(cur);
				cur++;
			}
			int x=use_machine(m);
			bc+=x/2;
		}
      	return n-bc;
	}
	else{
		while(cur<n){
			vector<int> m;
			for(int i=0;i<b.size();i++){
				m.PB(b[i]);
				if(cur==n || i==b.size()-1)break;
				m.PB(cur);
				cur++;
			}
			int x=use_machine(m);
			ac+=x/2;
		}
      	return ac;
	}
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:45:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   45 |    for(int i=0;i<a.size();i++){
      |                ~^~~~~~~~~
mushrooms.cpp:47:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   47 |     if(cur==n || i==a.size()-1)break;
      |                  ~^~~~~~~~~~~~
mushrooms.cpp:59:17: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   59 |    for(int i=0;i<b.size();i++){
      |                ~^~~~~~~~~
mushrooms.cpp:61:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   61 |     if(cur==n || i==b.size()-1)break;
      |                  ~^~~~~~~~~~~~

• Subtask 1: 56.5 / 100