Submission #414669

#	Time	Username	Problem	Language	Result	Execution time	Memory
414669		jeqcho	Parrots (IOI11_parrots)	C++17	98 / 100	10 ms	1328 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vpi;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define fi first
#define se second

// subtask 5: 7 points

void encode(int N, int M[])
{
	vector<bool> mes(8*N);
	F0R(i,N)
	{
		F0R(j,8)
		{
			if(M[i]&(1<<j))
			{
				mes[i*8+j]=1;
			}
		}
	}
	vi scheme[2];
	F0R(i,4*N)
	{
		bool f = mes[2*i];
		bool s = mes[2*i+1];
		int state=0;
		if(!f && !s)
		{
			state=0;
		}
		else if(f && !s)
		{
			state=1;
		}
		else if(!f && s)
		{
			state =2;
		}
		else
		{
			 state=3;
		}
		F0R(j,state)
		{
			scheme[0].pb(i);
		}
		F0R(j,3-state)
		{
			scheme[1].pb(i);
		}
	}
	if(sz(scheme[0])<sz(scheme[1]))
	{
		trav(e,scheme[0])
		{
			send(e);
		}
	}
	else
	{
		trav(e,scheme[1])
		{
			send(e);
		}
		F0R(i,4)
		{
			send(0);
		}
	}
}

decoder

#include "decoder.h"
#include "decoderlib.h"
#include <bits/stdc++.h>
using namespace std;

typedef long long ll;
typedef pair<int,int> pii;
typedef vector<int> vi;
typedef vector<pair<int,int>> vpi;

#define FOR(i,a,b) for (int i = (a); i < (b); ++i)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for (int i = (b)-1; i >= (a); --i)
#define R0F(i,a) ROF(i,0,a)
#define trav(a,x) for (auto& a: x)

#define pb push_back
#define rsz resize
#define sz(x) int(x.size())
#define all(x) begin(x), end(x)
#define fi first
#define se second

// subtask 5: 7 points

pair<bool,bool> d(int state, bool scheme)
{
	bool f,s;
	if(state==0)
	{
		f=0;
		s=0;
	}
	else if(state==1)
	{
		f=1;
		s=0;
	}
	else if(state==2)
	{
		f=0;
		s=1;
	}
	else
	{
		f=1;
		s=1;
	}
	if(scheme)
	{
		f=!f;
		s=!s;
	}
	return {f,s};
}

void decode(int N, int L, int X[])
{
	vi state(4*N);
	F0R(i,L)
	{
		int pos = X[i];
		++state[pos];
	}
	bool scheme=0;
	if(state[0]>=4)
	{
		state[0]-=4;
		scheme=1;
	}
	vector<bool> mes(8*N);
	F0R(i,4*N)
	{
		bool f,s;
		tie(f,s) = d(state[i],scheme);
		mes[2*i]=f;
		mes[2*i+1]=s;
	}
	vi ans(N);
	F0R(i,N)
	{
		ans[i] = 0;
		F0R(j,8)
		{
			ans[i] += mes[8*i+j]<<j;
		}
		output(ans[i]);
	}
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 29 / 29
• Subtask 5: 17 / 19