Submission #69251

#	Time	Username	Problem	Language	Result	Execution time	Memory
69251		Sa1378	Unscrambling a Messy Bug (IOI16_messy)	C++17	20 / 100	3 ms	512 KiB

messy

#include <bits/stdc++.h>
#include "messy.h"
using namespace std;
#define N ((int)201)

int n,ans[N];
string now;

string ok(int p)
{
	string s=now;
	if(p)for(int i=0;i<n;i++)s[i]=((s[i]=='0')?'1':'0');
	return s;
}

void ask(int l,int r)
{
	if(l>=r-1)return ;
	if(l==r-2)
	{
		now[l]='1';add_element(ok(0));now[l]='0';
		return ;
	}
	int mid=(l+r+1)/2;
	now[l]='1';add_element(ok(0));now[l]='0';
	for(int i=l+1;i<mid;i++)now[i]='1',add_element(ok(1)),now[i]='0';
	now[l]='1';
	ask(l+1,mid);ask(mid,r);
	now[l]='0';
	return ;
}

void solve(int l,int r,vector <int> valid)
{
//	cout<<l<<" "<<r<<"||| \n";
//	for(auto u:valid)cout<<u<<" ";cout<<"\n";
	if(l>=r)return ;
	if(l==r-1){ans[l]=valid[0];return ;}
	int id=-1;
	for(int p=0;p<valid.size();p++)
	{
		int i=valid[p];
		if(now[i]=='1')continue;
		now[i]='1';
//		cout<<ok(0)<<"\n";
		if(p==(int)valid.size()-1 || check_element(ok(0)))
		{
			id=i;ans[l]=id;
			now[i]='0';// now[id] is 1
			//cout<<id<<"..\n";
			break;
		}
		now[i]='0';
	}
	if(l==r-2)
	{
		for(auto i:valid)
			if(i!=ans[l])
				ans[r-1]=i;
		return ;
	}
//	cout<<id<<"..\n";
	int mid=(l+r+1)/2;
	vector <int> valid_lft,valid_rght;
	for(auto i:valid)
		if(now[i]=='0')
		{
			now[i]='1';
		//	cout<<ok(1)<<"\n";
			if(valid_rght.size()==r-mid || check_element(ok(1)))
				valid_lft.push_back(i);//cout<<i<<"\n";
			else if(i!=id)valid_rght.push_back(i);
			now[i]='0';
		}
	now[id]='1';
	solve(l+1,mid,valid_lft);
	solve(mid,r,valid_rght);
	now[id]='0';
}

vector<int> restore_permutation(int m, int w, int r)
{
	n=m;
	for(int i=0;i<n;i++)now+='0';
	ask(0,n);
	compile_set();
	vector <int> res;
	for(int i=0;i<n;i++)res.push_back(i);
	solve(0,n,res);
	for(int i=0;i<n;i++)res[ans[i]]=i;//,cout<<i<<" "<<ans[i]<<"\n";;
    return res;
}

Compilation message (stderr)

messy.cpp: In function 'void solve(int, int, std::vector<int>)':
messy.cpp:40:15: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
  for(int p=0;p<valid.size();p++)
              ~^~~~~~~~~~~~~
messy.cpp:70:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
    if(valid_rght.size()==r-mid || check_element(ok(1)))
       ~~~~~~~~~~~~~~~~~^~~~~~~

• Subtask 1: 20 / 20
• Subtask 2: 0 / 18
• Subtask 3: 0 / 11
• Subtask 4: 0 / 21
• Subtask 5: 0 / 30