Submission #900285

#	Time	Username	Problem	Language	Result	Execution time	Memory
900285		boyliguanhan	Parrots (IOI11_parrots)	C++17	98 / 100	6 ms	1568 KiB

encoder

#include "encoder.h"
#include "encoderlib.h"
void encode(int N, int M[]) {
    int sum=0;
    for(int i = 0; i < N; i++)
        for(int j = 0; j < 4; j++)
            sum+=(M[i]>>j*2)&3;
    if(sum>6*N)
        send(0),send(0),send(0),send(0);
    for(int i = 0; i < N; i++)
        for(int j = 0; j < 4; j++)
            for(int k = 0; k < (((sum>6*N?255-M[i]:M[i])>>j*2)&3); k++)
                send(i*4+j);
}

decoder

#include "decoder.h"
#include "decoderlib.h"
void decode(int N, int L, int X[]) {
    int res[N]{},cnt[256]{}, inv=0;
    for(int i = 0; i < L; i++) {
        cnt[X[i]]++,res[X[i]/4] += 1 << (X[i]&3)*2;
        if(cnt[X[i]]==4)
            res[0]-=4,inv=1;
    }
    for(auto i: res)
        output(inv?255-i:i);
}

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