Submission #355488

#	Time	Username	Problem	Language	Result	Execution time	Memory
355488		juggernaut	Counting Mushrooms (IOI20_mushrooms)	C++14	92.24 / 100	13 ms	516 KiB

mushrooms

#include "mushrooms.h"
#ifndef EVAL
#include "stub.cpp"
#endif
#include <bits/stdc++.h>
using namespace std;
const int rt = 170;
int count_mushrooms(int n) {
	int ans = 1;
	vector<int> A, B;
	A.push_back(0);
	if(n <= 220){
		for(int i=1;i<n;i++){
			vector<int> tmp = {0,i};
			int t = use_machine(tmp);
			if(t == 0)A.push_back(i), ans++;
			else B.push_back(i);
		}return ans;
	}
	
	for(int i=1;i<4;i++){
		vector<int> tmp = {0,i};
		int t = use_machine(tmp);
		if(t == 0)A.push_back(i), ans++;
		else B.push_back(i);
	}
	for(int i=4;i<rt;i+=2){
		if(A.size() >= B.size()){
			vector<int> tmp = {A[0], i, A[1], i+1};
			int t = use_machine(tmp);
			if(t&1){
				B.push_back(i+1);
			}else {
				A.push_back(i+1);
				ans++;
			}
			if(t&2){
				B.push_back(i);
			}else {
				A.push_back(i);
				ans++;
			}
		}else {
			vector<int> tmp = {B[0], i, B[1], i+1};
			int t = use_machine(tmp);
			if(t&1){
				A.push_back(i+1);
				ans++;
			}else {
				B.push_back(i+1);
			}
			if(t&2){
				A.push_back(i);
				ans++;
			}else {
				B.push_back(i);
			}
		}
	}
	for(int i=rt; i<n; i++){
		if(A.size() >= B.size()){
			vector<int> tmp;
			for(int j=0;j<(int)A.size();j++){
				if(i == n)break;
				tmp.push_back(A[j]);
				tmp.push_back(i++);
			}int t = use_machine(tmp);
			if(t%2==1){
				B.push_back(tmp.back());
				t ^= 1;
			}else A.push_back(tmp.back()),ans++;
			int sz = (tmp.size()-1)/2;
			ans += (sz*2-t)/2;
		}else {
			vector<int> tmp;
			for(int j=0;j<(int)B.size();j++){
				if(i == n)break;
				tmp.push_back(B[j]);
				tmp.push_back(i++);
			}int t = use_machine(tmp);
			if(t%2==1){
				A.push_back(tmp.back());
				t ^= 1;
				ans++;
			}else B.push_back(tmp.back());
			ans += (t)/2;
		}
		i--;
	}
	return ans;
}
 
 
 
 

• Subtask 1: 92.2449 / 100