Submission #960249

#	Time	Username	Problem	Language	Result	Execution time	Memory
960249		GrindMachine	Parrots (IOI11_parrots)	C++17	98 / 100	7 ms	1552 KiB

encoder

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*

refs:
edi

*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "encoder.h"
#include "encoderlib.h"

void encode(int n, int a[])
{
    int cost1 = 0, cost2 = 0;

    rep(i,n){
        int x = a[i];
        rep(bit,4){
            int f1 = 1<<bit, f2 = 1<<(bit+4);
            int b1 = 0, b2 = 0;
            if(x&f1) b1 = 1;
            if(x&f2) b2 = 1;
            int times = b1|(b2<<1);
            cost1 += times;
            cost2 += times^3;
        }
    }

    bool flip = false;
    if(cost2 < cost1) flip = true;

    if(flip){
        rep(i,4){
            send(0);
        }
    }
    
    int ptr = 0;

    rep(i,n){
        int x = a[i];
        rep(bit,4){
            int f1 = 1<<bit, f2 = 1<<(bit+4);
            int b1 = 0, b2 = 0;
            if(x&f1) b1 = 1;
            if(x&f2) b2 = 1;
            int times = b1|(b2<<1);
            if(flip) times ^= 3;
            int val = i*4+bit;
            rep(j,times){
                send(val);
            }
        }
    }
}

decoder

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>

using namespace std;
using namespace __gnu_pbds;

template<typename T> using Tree = tree<T, null_type, less<T>, rb_tree_tag, tree_order_statistics_node_update>;
typedef long long int ll;
typedef long double ld;
typedef pair<int,int> pii;
typedef pair<ll,ll> pll;

#define fastio ios_base::sync_with_stdio(false); cin.tie(NULL)
#define pb push_back
#define endl '\n'
#define sz(a) (int)a.size()
#define setbits(x) __builtin_popcountll(x)
#define ff first
#define ss second
#define conts continue
#define ceil2(x,y) ((x+y-1)/(y))
#define all(a) a.begin(), a.end()
#define rall(a) a.rbegin(), a.rend()
#define yes cout << "Yes" << endl
#define no cout << "No" << endl

#define rep(i,n) for(int i = 0; i < n; ++i)
#define rep1(i,n) for(int i = 1; i <= n; ++i)
#define rev(i,s,e) for(int i = s; i >= e; --i)
#define trav(i,a) for(auto &i : a)

template<typename T>
void amin(T &a, T b) {
    a = min(a,b);
}

template<typename T>
void amax(T &a, T b) {
    a = max(a,b);
}

#ifdef LOCAL
#include "debug.h"
#else
#define debug(x) 42
#endif

/*



*/

const int MOD = 1e9 + 7;
const int N = 1e5 + 5;
const int inf1 = int(1e9) + 5;
const ll inf2 = ll(1e18) + 5;

#include "decoder.h"
#include "decoderlib.h"

void decode(int n, int m, int X[])
{
    vector<int> cnt(4*n);
    rep(i,m) cnt[X[i]]++;

    bool flip = false;
    if(cnt[0] >= 4){
        flip = true;
        cnt[0] -= 4;
    }

    vector<int> a(n);
    rep(i,4*n){
        int c = cnt[i];
        if(!c) conts;
        int ind = i/4, bit = i%4;
        int f1 = 1<<bit, f2 = 1<<(bit+4);
        if(c&1){
            a[ind] |= f1;
        }
        if(c&2){
            a[ind] |= f2;
        }
    }

    if(flip){
        rep(i,n) a[i] ^= 255;
    }

    rep(i,n){
        output(a[i]);
    }
}

Compilation message (stderr)

encoder.cpp: In function 'void encode(int, int*)':
encoder.cpp:90:9: warning: unused variable 'ptr' [-Wunused-variable]
   90 |     int ptr = 0;
      |         ^~~

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