Submission #399097

#	Time	Username	Problem	Language	Result	Execution time	Memory
399097		Antekb	버섯 세기 (IOI20_mushrooms)	C++17	45.38 / 100	13 ms	396 KiB

mushrooms

#include "mushrooms.h"
#include<bits/stdc++.h>
#define st first
#define nd second
#define pb(x) push_back(x)
using namespace std;
int count_mushrooms(int n) {
	vector<int> A, B, C(n-1);
	A.pb(0);
	iota(C.begin(), C.end(), 1);
	int k=400;
	for(int i=0; i<k && size(C); i++){
		int c1 = use_machine({0, C.back()});
		if(c1==1)B.pb(C.back());
		else A.pb(C.back());
		C.pop_back();
	}
	bool swa=0;
	if(A.size()<B.size()){
		swap(A, B);
		swa=1;
	}
	int a=size(A),b=size(B);
	while(C.size()){
		int t=min(A.size(), C.size());
		vector<int> V;
		for(int i=0; i<t; i++){
			V.pb(A[i]);
			V.pb(C.back());
			C.pop_back();
		}
		int c=use_machine(V);
		b+=(c+1)/2;
		a+=t-(c+1)/2;
	}
	if(swa)swap(a, b);
	return a;
}

• Subtask 1: 45.3815 / 100