Submission #997067

#	Time	Username	Problem	Language	Result	Execution time	Memory
997067		huutuan	Magic Show (APIO24_show)	C++17	100 / 100	6 ms	25400 KiB

Alice

#include <vector>
#include "Alice.h"

// you may define some global variables, but it does not work if you try to transfer any information from function Alice() to function Bob() through these variables.
// you had better not use the same global variables in function Alice() and in function Bob().

#include <bits/stdc++.h>

using namespace std;

#define int long long

namespace Alice_solver{
   const int BIT=64;
   int c[100][100];
   vector<int> encode(int x){
      vector<int> ans(BIT);
      for (int i=0, rem=BIT/2; i<BIT; ++i){
         if (x>=c[BIT-i-1][rem-1]){
            x-=c[BIT-i-1][rem-1];
            --rem;
            ans[i]=1;
         }
      }
      return ans;
   }
   int decode(vector<int> v){
      int ans=0;
      for (int i=0, rem=BIT/2; i<BIT; ++i){
         if (v[i]){
            ans+=c[BIT-i-1][rem-1];
            --rem;
         }
      }
      return ans;
   }
   int mp[5000], rmp[5000];
   mt19937_64 rng(69420);
   int SUS;
   void precalc(){
      for (int i=0; i<=BIT; ++i) c[i][0]=c[i][i]=1;
      for (int i=1; i<=BIT; ++i){
         for (int j=1; j<i; ++j) c[i][j]=c[i-1][j-1]+c[i-1][j];
      }
      iota(mp, mp+5000, 0);
      shuffle(mp, mp+5000, rng);
      for (int i=0; i<5000; ++i) rmp[mp[i]]=i;
      SUS=uniform_int_distribution<int>(0, 1ll<<59)(rng);
   }
   vector<pair<int32_t, int32_t>> solve(){
      precalc();
      long long x=setN(5000); x^=SUS;
      vector<int> v=encode(x);
      for (int i:v) cerr << i;
      cerr << endl;
      vector<pair<int32_t, int32_t>> ans;
      for (int i=0; i<5000/(BIT+2)*(BIT+2); i+=BIT+2){
         for (int j=0; j<BIT; ++j){
            int t1=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
            int t2=t1;
            while (t1==t2) t2=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
            if (v[j]){
               ans.emplace_back(i+j, t1);
            }else{
               ans.emplace_back(i+j, t2);
            }
         }
         int t=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
         ans.emplace_back(t, i+BIT);
         ans.emplace_back(t, i+BIT+1);
      }
      for (int i=5000/(BIT+2)*(BIT+2)+1; i<5000; ++i) ans.emplace_back(i-1, i);
      for (auto &i:ans) i.first=mp[i.first]+1, i.second=mp[i.second]+1;
      return ans;
   }
}

vector<pair<int32_t,int32_t>> Alice(){
   // add your code here
   
   // change below into your code
   return Alice_solver::solve();
}

Bob

#include <vector>
#include "Bob.h"

// you may define some global variables, but it does not work if you try to transfer any information from function Alice() to function Bob() through these variables.
// you had better not use the same global variables in function Alice() and in function Bob().

#include <bits/stdc++.h>

using namespace std;

#define int long long

namespace Bob_solver{
   const int BIT=64;
   int c[100][100];
   vector<int> encode(int x){
      vector<int> ans(BIT);
      for (int i=0, rem=BIT/2; i<BIT; ++i){
         if (x>=c[BIT-i-1][rem-1]){
            x-=c[BIT-i-1][rem-1];
            --rem;
            ans[i]=1;
         }
      }
      return ans;
   }
   int decode(vector<int> v){
      int ans=0;
      for (int i=0, rem=BIT/2; i<BIT; ++i){
         if (v[i]){
            ans+=c[BIT-i-1][rem-1];
            --rem;
         }
      }
      return ans;
   }
   int mp[5000], rmp[5000];
   mt19937_64 rng(69420);
   int SUS;
   void precalc(){
      for (int i=0; i<=BIT; ++i) c[i][0]=c[i][i]=1;
      for (int i=1; i<=BIT; ++i){
         for (int j=1; j<i; ++j) c[i][j]=c[i-1][j-1]+c[i-1][j];
      }
      iota(mp, mp+5000, 0);
      shuffle(mp, mp+5000, rng);
      for (int i=0; i<5000; ++i) rmp[mp[i]]=i;
      SUS=uniform_int_distribution<int>(0, 1ll<<59)(rng);
   }
   bool adj[5000][5000];
   int solve(vector<pair<int32_t, int32_t>> edge){
      precalc();
      for (auto &i:edge) i.first=rmp[i.first-1], i.second=rmp[i.second-1], adj[i.first][i.second]=adj[i.second][i.first]=1;
      vector<int> v(BIT);
      for (int i=0; i<5000/(BIT+2)*(BIT+2); i+=BIT+2){
         for (int j=0; j<BIT; ++j){
            int t1=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
            int t2=t1;
            while (t1==t2) t2=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
            if (adj[i+j][t1]) v[j]=1;
         }
         int t=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
      }
      for (int i:v) cerr << i;
      cerr << endl;
      return decode(v)^SUS;
   }
}

long long Bob(vector<pair<int32_t,int32_t>> V){
   // add your code here
   
   // return 3; // change this into your code
   return Bob_solver::solve(V);
}

Compilation message (stderr)

Bob.cpp: In function 'long long int Bob_solver::solve(std::vector<std::pair<int, int> >)':
Bob.cpp:62:14: warning: unused variable 't' [-Wunused-variable]
   62 |          int t=uniform_int_distribution<int>(5000/(BIT+2)*(BIT+2), 4999)(rng);
      |              ^

• Subtask 1: 5 / 5
• Subtask 2: 30 / 30
• Subtask 3: 65 / 65