Submission #351975

#	Time	Username	Problem	Language	Result	Execution time	Memory
351975		juggernaut	Parrots (IOI11_parrots)	C++14	99 / 100	48 ms	1696 KiB

encoder

#include"encoder.h"
#include"encoderlib.h"
#include<bits/stdc++.h>
using namespace std;
void encode(int n,int a[]){
    vector<int>best(n*15,0);
    int sig;
    for(int xr=0;xr<256;xr++){
        vector<int>vec;
        for(int i=0;i<n;i++){
            int x=a[i]^xr;
            while(x>63)vec.push_back((i<<2)|3),x-=64;
            while(x>15)vec.push_back((i<<2)|2),x-=16;
            while(x>3)vec.push_back((i<<2)|1),x-=4;
            while(x>0)vec.push_back((i<<2)|0),x-=1;
        }
        if(vec.size()<best.size())best=vec,sig=xr;
    }
    for(auto to:best)send(to);
    for(int i=0;i<5;i++)send(sig);
}

decoder

#include"decoder.h"
#include"decoderlib.h"
#include<bits/stdc++.h>
using namespace std;
int res[64],counter[256];
void decode(int n,int m,int a[]){
    for(int i=0;i<n;i++)res[i]=0;
    for(int i=0;i<256;i++)counter[i]=0;
    int mx=0,val;
    for(int i=0;i<m;i++)
        counter[a[i]]++;
    for(int i=0;i<256;i++)if(counter[i]>mx)mx=counter[i],val=i;
    mx=0;
    for(int i=0;i<m;i++){
        if(a[i]==val&&mx!=5){
            mx++;
            continue;
        }
        int data=a[i]&3;
        if(data==0)res[a[i]>>2]+=1;
        if(data==1)res[a[i]>>2]+=4;
        if(data==2)res[a[i]>>2]+=16;
        if(data==3)res[a[i]>>2]+=64;
    }
    for(int i=0;i<n;i++)output(res[i]^val);
}

Compilation message (stderr)

encoder.cpp: In function 'void encode(int, int*)':
encoder.cpp:20:29: warning: 'sig' may be used uninitialized in this function [-Wmaybe-uninitialized]
   20 |     for(int i=0;i<5;i++)send(sig);
      |                         ~~~~^~~~~

decoder.cpp: In function 'void decode(int, int, int*)':
decoder.cpp:25:31: warning: 'val' may be used uninitialized in this function [-Wmaybe-uninitialized]
   25 |     for(int i=0;i<n;i++)output(res[i]^val);
      |                         ~~~~~~^~~~~~~~~~~~

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