Submission #67280

#	Time	Username	Problem	Language	Result	Execution time	Memory
67280		RezwanArefin01	Parrots (IOI11_parrots)	C++17	96 / 100	16 ms	2528 KiB

encoder

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

void encode(int N, int M[]) {
    if(N <= 32) {
        for(int i = 0; i < 8 * N; i++) {
            int c = (M[i / 8] >> (7 - i % 8)) & 1; 
            if(c) send(i);
        }
    } else {
        vector<pair<int, int> > v; 
        int one = 0, zero = 0;
        for(int i = 0; i < 4 * N; i++) {
            int c = M[i / 4] >> ((3 - (i % 4)) * 2) & 3; 
            v.emplace_back(i, c); 
            one += c; 
            zero += 3 - c; 
        }
        if(zero < one) { 
            for(auto &x : v) 
                x.second = 3 - x.second; 
            send(255); send(255); send(255); send(255); 
        }
        for(auto &x : v) 
            while(x.second--) send(x.first); 
    }
}

decoder

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

void decode(int N, int L, int X[]) {
    int a[N * 8];
    memset(a, 0, sizeof a);
    if(N <= 32) {
        for(int i = 0; i < L; i++) 
            a[X[i]] = 1; 
        for(int i = 0; i < N; i++) {
            int num = 0; 
            for(int j = i * 8; j < (i + 1) * 8; j++) 
                num = num * 2 + a[j];
            output(num);
        }
    } else {
        int zero = 0;
        for(int i = 0; i < L; i++) 
            a[X[i]]++; 
        if(a[255] >= 4) {
            a[255] -= 4, 
            zero = 1; 
        }
        for(int i = 0; i < 4 * N && zero; i++) 
            a[i] = 3 - a[i]; 
        for(int i = 0; i < N; i++) {
            int num = 0;
            for(int j = i * 4; j < (i + 1) * 4; j++) 
                num = num * 4 + a[j];
            output(num);
        }    
    }
}

• Subtask 1: 17 / 17
• Subtask 2: 17 / 17
• Subtask 3: 18 / 18
• Subtask 4: 29 / 29
• Subtask 5: 15 / 19