Submission #601928

#	Time	Username	Problem	Language	Result	Execution time	Memory
601928		FatihSolak	Counting Mushrooms (IOI20_mushrooms)	C++17	33.73 / 100	12 ms	324 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
#define N 20000
#define X 65
using namespace std;

int count_mushrooms(int n){
	int mini = 0;
	int val = 1e9;
	for(int i = 1;i<N;i++){
		if(i-1 + (N - i + (i+1)/2 -1)/( (i+1)/2) < val){
			val = i-1 + (N - 1)/i;
			mini = i;
		}
	}
	//cout << mini << " " << val << endl;
	if(n <= 227){
		int ret = 1;
		for(int i = 1;i<n;i++){
			ret += !(use_machine({0,i}));
		}
		return ret;
	}
	vector<int> a,b;
	a.push_back(0);
	for(int i = 1;i<=X;i++){
		if(use_machine({0,i})){
			b.push_back(i);
		}
		else a.push_back(i);
	}
	int ret = 0;
	int asz = a.size();
	int bsz = b.size();
	if(asz > bsz){
		for(int i = X+1;i<n;i+=asz){
			vector<int> nums;
			int cnt = 0;
			for(int j = i;j<min(n,i + asz);j++){
				nums.push_back(a[cnt++]);
				nums.push_back(j);
			}
			int sz = nums.size()/2;
			ret += sz - (use_machine(nums) + 1)/2;
		}
	}
	else{
		for(int i = X+1;i<n;i+=bsz){
			vector<int> nums;
			int cnt = 0;
			for(int j = i;j<min(n,i + bsz);j++){
				nums.push_back(b[cnt++]);
				nums.push_back(j);
			}
			int sz = nums.size()/2;
			ret += (use_machine(nums) + 1)/2;
		}
	}

	return ret + asz;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:55:8: warning: unused variable 'sz' [-Wunused-variable]
   55 |    int sz = nums.size()/2;
      |        ^~
mushrooms.cpp:8:6: warning: variable 'mini' set but not used [-Wunused-but-set-variable]
    8 |  int mini = 0;
      |      ^~~~

• Subtask 1: 33.7313 / 100