Submission #388062

#	Time	Username	Problem	Language	Result	Execution time	Memory
388062		Supersonic	Counting Mushrooms (IOI20_mushrooms)	C++14	83.39 / 100	11 ms	328 KiB

mushrooms

#include "mushrooms.h"
#include <bits/stdc++.h>
using namespace std;
int count_mushrooms(int n) {
	int k=141;
	vector<int> a;vector<int> b;a.push_back(0);
	int r1=use_machine({0,1});if(r1)b.push_back(1);else a.push_back(1);
	if(n==2)return a.size();
	int r2=use_machine({0,2});if(r2)b.push_back(2);else a.push_back(2);
	if(n==3)return a.size();
	int c=3;
	if(a.size()>=2){
		while(c<n-1&&max(a.size(),b.size())<k){
			r1=use_machine({a[0],c,a[1],c+1});
			if(r1==0){a.push_back(c);a.push_back(c+1);}
			if(r1==1){a.push_back(c);b.push_back(c+1);}
			if(r1==2){b.push_back(c);a.push_back(c+1);}
			if(r1==3){b.push_back(c);b.push_back(c+1);}
			c+=2;
		}
	}
	else{
		while(c<n-1&&max(a.size(),b.size())<k){
			r1=use_machine({b[0],c,b[1],c+1});
			if(r1==0){b.push_back(c);b.push_back(c+1);}
			if(r1==1){b.push_back(c);a.push_back(c+1);}
			if(r1==2){a.push_back(c);b.push_back(c+1);}
			if(r1==3){a.push_back(c);a.push_back(c+1);}
			c+=2;
		}
	}
	if(c==n-1){
		if(use_machine({0,n-1})==1)b.push_back(n-1);
		else a.push_back(n-1);
		c++;
	}
	if(c==n)return a.size();
	int as=a.size();
	while(c<n){
		if(a.size()>b.size()){
			vector<int> q;int t=0;
			for(auto i:a){q.push_back(i);t++;q.push_back(c);c++;if(c==n)break;}
			r1=use_machine(q);
			if(r1%2==1)b.push_back(q[q.size()-1]);
			r1++;r1/=2;as+=(t-r1);
		}
		else {
			vector<int> q;
			for(auto i:b){q.push_back(i);q.push_back(c);c++;if(c==n)break;}
			r1=use_machine(q);
			if(r1%2==1)a.push_back(q[q.size()-1]);
			r1++;r1/=2;as+=r1;
		}
	}
	return as;
}

Compilation message (stderr)

mushrooms.cpp: In function 'int count_mushrooms(int)':
mushrooms.cpp:13:38: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   13 |   while(c<n-1&&max(a.size(),b.size())<k){
      |                ~~~~~~~~~~~~~~~~~~~~~~^~
mushrooms.cpp:23:38: warning: comparison of integer expressions of different signedness: 'const long unsigned int' and 'int' [-Wsign-compare]
   23 |   while(c<n-1&&max(a.size(),b.size())<k){
      |                ~~~~~~~~~~~~~~~~~~~~~~^~

• Subtask 1: 83.3948 / 100