Submission #602076

#	Time	Username	Problem	Language	Result	Execution time	Memory
602076		FatihSolak	Counting Mushrooms (IOI20_mushrooms)	C++17	92.62 / 100	10 ms	352 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#define N 20000
using namespace std;

int count_mushrooms(int n){
	vector<int> a,b;
	a.push_back(0);
	int point  = 1;
	int cur = 0;
	while(cur < 89 && n-point > max(a.size(),b.size()) ){
		if(max(a.size(),b.size()) == 1){
			if(use_machine({0,point})){
				b.push_back(point);
			}
			else a.push_back(point);
			point++;
		}
		else{
			if(a.size() > b.size()){
				vector<int> ask;
				ask.push_back(a[0]);
				ask.push_back(point++);
				ask.push_back(a[1]);
				ask.push_back(point++);
				int val = use_machine(ask);
				if(val < 2){
					a.push_back(ask[1]);
				}
				else{
					b.push_back(ask[1]);
				}
				if(val % 2 == 0){
					a.push_back(ask[3]);
				}
				else{
					b.push_back(ask[3]);
				}
			}
			else{
				vector<int> ask;
				ask.push_back(b[0]);
				ask.push_back(point++);
				ask.push_back(b[1]);
				ask.push_back(point++);
				int val = use_machine(ask);
				if(val < 2){
					b.push_back(ask[1]);
				}
				else{
					a.push_back(ask[1]);
				}
				if(val % 2 == 0){
					b.push_back(ask[3]);
				}
				else{
					a.push_back(ask[3]);
				}
			}
		}
		cur++;
	}
	int ret = a.size();
	while(point < n){
		int asz = a.size();
		int bsz = b.size();
		if(asz > bsz){
			vector<int> nums;
			int cnt = 0;
			for(int j = point;j<min(n,point + asz);j++){
				nums.push_back(a[cnt++]);
				nums.push_back(j);
			}
			int sz = nums.size()/2;
			int val = use_machine(nums);
			point += asz;
			if(val&1){
				b.push_back(point-1);
			}
			else a.push_back(point-1);
			ret += sz - (val + 1)/2;
		}
		else{
			vector<int> nums;
			int cnt = 0;
			for(int j = point;j<min(n,point + bsz);j++){
				nums.push_back(b[cnt++]);
				nums.push_back(j);
			}
			int sz = nums.size()/2;
			int val = use_machine(nums);
			point += bsz;
			if(val&1){
				a.push_back(point-1);
			}
			else b.push_back(point-1);
			ret += (val + 1)/2;
		}
	}
	return ret;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:11:28: warning: comparison of integer expressions of different signedness: 'int' and 'const long unsigned int' [-Wsign-compare]
   11 |  while(cur < 89 && n-point > max(a.size(),b.size()) ){
      |                    ~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
mushrooms.cpp:90:8: warning: unused variable 'sz' [-Wunused-variable]
   90 |    int sz = nums.size()/2;
      |        ^~

• Subtask 1: 92.623 / 100