Submission #746123

#	Time	Username	Problem	Language	Result	Execution time	Memory
746123		almothana05	Highway Tolls (IOI18_highway)	C++14	0 / 100	3067 ms	8452 KiB

highway

#include "highway.h"
#include <bits/stdc++.h>
using namespace std;
vector<pair<int , int> >kinder[300000] , ka;
vector<int>cent , ed;
int sub[300000], vis[300000];
long long a , b , menge , cmp , comp ,numm  , kind , vase;
int nummer;
int st , en , mid , mit;
int centroid(int x , int f , int n){
  for(int i = 0 ; i < kinder[x].size() ; i++){
    kind = kinder[x][i].first;
    if(vis[kind] != 2 &&kind != f && sub[kind] * 2 >= n){
      return centroid(kind , x , n);
    }
  }
  for(int i = 0 ; i < kinder[x].size() ; i++){
    ed[kinder[x][i].second] = 1;
  }
  vis[x] = 2;
  return x;
}
int dfs(int x){
  vis[x] = 1;
  sub[x] = 1;
  for(int i = 0 ; i < kinder[x].size() ; i++){
    kind = kinder[x][i].first;
    if(vis[kind] == 0){
      sub[x] += dfs(kind);
    }
  }
  return sub[x];
}
int bis(int x , int y , long long z ,int f , int root){
    for(int i = 0 ; i <= y ; i++){
      ed[kinder[root][i].second] = 1;
    }
    st = x ; en = y; mid = y;
    while(st <= en){
      mit = (st + en)/2;
      
        while(mid > mit){
          if(kinder[root][mid].first == f || vis[kinder[root][mid].first] == 2){
            mid--;
            continue;
          }
          ed[kinder[root][mid].second] = 0;
          mid--;
        }
        
        while(mid <= mit){
          if(kinder[root][mid].first == f || vis[kinder[root][mid].first] == 2){
            mid++;
            continue;
          }
          ed[kinder[root][mid].second] = 1;
          mid++;
        }
        if(mid > mit){
          mid--;
        }
        
      numm = ask(ed);
      if(numm >= z){
        en = mit - 1;
      }
      else{
        st = mit + 1;
      }
    }
    for(int i = 0 ; i <= y ; i++){
      ed[kinder[root][i].second] = 1;
    }
    return st;
}
int suche(int x){
  // cout << x << "\n";
  dfs(x);
  nummer = centroid(x ,x , sub[x]);
  
  // cout << nummer << ' ' << x << "\n";
  // cout << kinder[nummer].size() << "\n";
  int fater = -1,pl;
  for(int i = 0 ; i < kinder[nummer].size() ; i++ ){
    if(sub[kinder[nummer][i].first] > sub[nummer] && vis[kinder[nummer][i].first] != 2){
      fater = kinder[nummer][i].first;
      break;
    }
  }
  // cout << fater << "\n";
  cmp = ask(ed);
  // cout << cmp - comp << "\n";
  if(nummer == x){
    if(cmp == comp){
      return nummer;
    }
    else{
      comp = cmp;
      pl = bis(0 , kinder[nummer].size() - 1 , cmp , fater , nummer );
    }
  }
  else{
    if(cmp == comp){
      return suche(x);
    }
    else if(cmp == comp + b - a){
      comp = cmp;
      while(true);
      return nummer;
    }
    else{
      comp = cmp;
      pl = bis(0 , kinder[nummer].size() - 1 , cmp , fater , nummer );
      // cout << kinder[nummer].size() << "\n";
    }
  }
  return suche(kinder[nummer][pl].first);
}





void finde(){
  cent.clear();
  ka.clear();
  for(int i = 0 ; i < menge ; i++){
    if(vis[i] == 0){
      ka.push_back({i , dfs(i)});
    }
  }
  
  for(int i = 0 ; i < ka.size() ; i++){
    cent.push_back(centroid(ka[i].first , ka[i].first , ka[i].second));
    // cout << cent[i] << ' ';
  }
  // cout << "\n";
  for(int i = 0 ; i < menge ; i++){
    if(vis[i] == 1){
      vis[i] = 0;
    }
  }
  ka.clear();
  comp = ask(ed);
  vase = comp;
  if(comp > cmp){
    st = 0 ; en = cent.size() - 2; mid = cent.size() - 1;
    while(st <= en){
      mit = (st + en)/2;
      
        while(mid > mit){
          for(int i = 0 ; i < kinder[cent[mid]].size() ; i++){
            ed[kinder[cent[mid]][i].second] = 0;
          }
          mid--;
        }
        

        while(mid <= mit){
          for(int i = 0 ; i < kinder[cent[mid]].size() ; i++){
            ed[kinder[cent[mid]][i].second] = 1;
          }
          mid++;
        }
        if(mid > mit){
          mid--;
        }
        
      numm = ask(ed);
      if(numm == comp){
        en = mit - 1;
      }
      else{
        st = mit + 1;
      }
    }
    int root , er  ,zw;
    root = cent[st];
    // cout << root << "\n";
    cent.clear();
    er = bis(0 , kinder[root].size() - 1 , cmp +b -a , -1 , root);
    // cout << er << "\n";
    if(comp == cmp + b - a){
      zw = root;
    }
    else{
      zw = bis(er , kinder[root].size() - 1 , comp , -1 , root);
      // cout << zw << ' ' << kinder[root][zw].first << "\n";
      // cout << kinder[root][er].first << "\n";
      zw = suche(kinder[root][zw].first);
      // cout << zw << "\n";
    }
    // comp = ask(ed);
    er = suche(kinder[root][er].first);
    // cout << er << "\n";
    answer(er , zw);
    return;
  }
  cent.clear();
  finde();
}
void find_pair(int N, vector<int> u, vector<int> v, int A, int B) {
  a = A;
  b = B;
  menge = N;

  for(int i = 0 ; i < u.size() ; i++){
    kinder[u[i]].push_back({v[i] , i});
    kinder[v[i]].push_back({u[i] , i});
    ed.push_back(0);
  }
  cmp = ask(ed);
  finde();
}

Compilation message (stderr)

highway.cpp: In function 'int centroid(int, int, int)':
highway.cpp:11:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   11 |   for(int i = 0 ; i < kinder[x].size() ; i++){
      |                   ~~^~~~~~~~~~~~~~~~~~
highway.cpp:17:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   17 |   for(int i = 0 ; i < kinder[x].size() ; i++){
      |                   ~~^~~~~~~~~~~~~~~~~~
highway.cpp: In function 'int dfs(int)':
highway.cpp:26:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   26 |   for(int i = 0 ; i < kinder[x].size() ; i++){
      |                   ~~^~~~~~~~~~~~~~~~~~
highway.cpp: In function 'int suche(int)':
highway.cpp:84:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
   84 |   for(int i = 0 ; i < kinder[nummer].size() ; i++ ){
      |                   ~~^~~~~~~~~~~~~~~~~~~~~~~
highway.cpp: In function 'void finde()':
highway.cpp:133:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  133 |   for(int i = 0 ; i < ka.size() ; i++){
      |                   ~~^~~~~~~~~~~
highway.cpp:152:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  152 |           for(int i = 0 ; i < kinder[cent[mid]].size() ; i++){
      |                           ~~^~~~~~~~~~~~~~~~~~~~~~~~~~
highway.cpp:160:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::pair<int, int> >::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  160 |           for(int i = 0 ; i < kinder[cent[mid]].size() ; i++){
      |                           ~~^~~~~~~~~~~~~~~~~~~~~~~~~~
highway.cpp: In function 'void find_pair(int, std::vector<int>, std::vector<int>, int, int)':
highway.cpp:207:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
  207 |   for(int i = 0 ; i < u.size() ; i++){
      |                   ~~^~~~~~~~~~

• Subtask 1: 0 / 5
• Subtask 2: 0 / 7
• Subtask 3: 0 / 6
• Subtask 4: 0 / 33
• Subtask 5: 0 / 18
• Subtask 6: 0 / 31