Submission #566802

#	Time	Username	Problem	Language	Result	Execution time	Memory
566802		Uzouf	Saveit (IOI10_saveit)	C++14	0 / 100	209 ms	19068 KiB

encoder

#include <bits/stdc++.h>
using namespace std;
#include "grader.h"
#include "encoder.h"
 
void encode(int n,int h,int p,int a[],int b[]) {
  
  vector<vector<int> > v(n+5);
    int dis[n+5][n+5];
 
    for (int i=0;i<n+5;i++) {
      for (int j=0;j<n+5;j++) {
        dis[i][j]=2000;
      }
      dis[i][i]=0;
    }
 
    for (int i=0;i<p;i++) {
      v[a[i]].push_back(b[i]);
      v[b[i]].push_back(a[i]);
      dis[a[i]][b[i]]=dis[b[i]][a[i]]=1;
    }
 
    int par[n+5];
    for (int i=0;i<n+5;i++) par[i]=i;
    queue<int> q;
    q.push(0); par[0]=-1;
 
    while (!q.empty()) {
      int i=q.front();
      q.pop();
      for (int j:v[i]) {
        if (par[j]==j) {
          par[j]=i; q.push(j);
        }
      }
    }
    //tree:
    for (int i=0;i<n;i++) {
      if (par[i]==-1) par[i]=i;
      for (int pp=0;pp<10;pp++) {
        if (((1<<pp)&par[i])==0) encode_bit(0);
        else encode_bit(1);
      }
    }
 
 
    for (int hub=1;hub<h;hub++) {
      //cout<<hub<<":"<<endl;
      int dis[n+5];
      bool vis[n+5];
      for (int i=0;i<n+5;i++) {
        vis[i]=false;
      }
      queue<int> q;
      q.push(hub); dis[hub]=0; vis[hub]=true;
 
      while (!q.empty()) {
        int i=q.front();
        q.pop();
        for (int j:v[i]) {
          if (!vis[j]) {
            vis[j]=true; dis[j]=dis[i]+1; q.push(j);
          }
        }
      }
 
      string ss;
      for (int i=0;i<n;i++) {
        int nm=dis[i]-dis[par[i]];
        if (nm==0) ss+='0';
        else if (nm==1) ss+='1';
        else ss+='2';
 
        if (ss.size()==3) {
          int lol=((ss[0]-'0')*9)+((ss[1]-'0')*3)+(ss[2]-'0');
          //if (hub==1) cout<<ss<<' '<<lol<<endl;
          for (int j=4;j>=0;j--) {
            int bb=1;
            if ((lol&(1<<j))==0) bb=0;
            //if (hub==1) cout<<bb<<' ';
            encode_bit(bb);
          }
          ss=""; //cout<<endl;
        }
      }
 
      if (ss.size()==0) continue;
      int lol=(ss[0]-'0');
      if (ss.size()==2) lol+=((ss[1]-'0')*3);
      //if (hub==1) cout<<ss<<' '<<lol<<endl;
      for (int j=4;j>=0;j--) {
        int bb=1;
        if ((lol&(1<<j))==0) bb=0;
        //if (hub==1) cout<<bb<<' ';
        encode_bit(bb);
      }//cout<<endl<<endl;
 
    }
  
}

decoder

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

void decode(int n,int h) {
  vector<vector<int> > v(n+5);
  bool done[n+5][n+5];
  int par[n+5];
  for (int i=0;i<n;i++) {
    int tmp=0;
    for (int p=0;p<10;p++) {
      tmp+=(decode_bit()*(1<<p));
    }
    par[i]=tmp;
    v[i].push_back(tmp); v[tmp].push_back(i);
  }
 
  for (int hub=0;hub<h;hub++) {
    int dis[n+5][n+5];
    memset(done,false,sizeof done);
 
    if (hub>0) {
      string ss;
      int tt=n/3;
      if (n%3!=0) tt++;
      int i=-1;
      while (tt--) {
        for (int i5=0;i5<5;i5++) ss+=(decode_bit()+'0');
 
        i+=3;
        int dec=0,ii=0;
        for (int j=4;j>=0;j--) {
          int rn=ss[ii]-'0';
          int cl=rn*(1<<j);
          dec+=cl; ii++;
        }
        //if (hub==1) cout<<ss<<' '<<dec<<endl;
 
        int l[3];
        l[0]=0; l[1]=0; l[2]=0;
        if (dec-9>=0) {dec-=9; l[0]=1; if (dec-9>=0) {dec-=9; l[0]=2;} }
        if (dec-3>=0) {dec-=3; l[1]=1; if (dec-3>=0) {dec-=3; l[1]=2;} }
        if (dec-1>=0) {dec-=1; l[2]=1; if (dec-1>=0) {dec-=9; l[2]=2;} }
 
        //if (hub==2) cout<<l[0]<<' '<<l[1]<<' '<<l[2]<<endl;
 
        int indx=2;
        for (int j=min(i,n-1);j>=i-2;j--) {
          if (done[j][par[j]]) continue;
          done[j][par[j]]=true; done[par[j]][j]=true;
          if (l[indx]==0) {
            dis[j][par[j]]=0; dis[par[j]][j]=0;
          }
          else if (l[indx]==1) {
            dis[par[j]][j]=1; dis[j][par[j]]=-1;
          }
          else {
            dis[j][par[j]]=1; dis[par[j]][j]=-1;
          }
          //if (hub==1) cout<<j<<' '<<par[j]<<' '<<dis[j][par[j]]<<' '<<dis[par[j]][j]<<endl;
          indx--;
        }
        ss="";
 
      }
 
    }
    else {
      for (int i=0;i<n;i++) {
        for (int j=0;j<n;j++) dis[i][j]=1;
      }
    }
 
    queue<int> q;
    int ans[n+5];
    bool vis[n+5];
    memset(vis,false,sizeof vis);
    ans[hub]=0; q.push(hub); vis[hub]=true;
 
    while (!q.empty()) {
      int i=q.front();
      q.pop();
      hops(hub,i,ans[i]);
 
      for (int j:v[i]) {
        if (!vis[j]) {
          q.push(j); ans[j]=ans[i]+dis[i][j]; vis[j]=true;
        }
      }
    }
 
  }
 
}

• Subtask 1: 0 / 25
• Subtask 2: 0 / 25
• Subtask 3: 0 / 25
• Subtask 4: 0 / 25