Submission #189109

#	Time	Username	Problem	Language	Result	Execution time	Memory
189109		Nucleist	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	100 / 100	270 ms	65896 KiB

skyscraper

#include <bits/stdc++.h> 
using namespace std; 
#define flash ios_base::sync_with_stdio(false); cin.tie(0); cout.tie(0)
#define debug(x) cerr << " - " << #x << ": " << x << endl;
#define debugs(x, y) cerr << " - " << #x << ": " << x << " " << #y << ": " << y << endl;
#define all(x) (x).begin(),(x).end()
#define sz(x) (int)x.size()
#define ll long long
#define INF 1000000000
#define MOD 1000000007
#define pb push_back
#define ve vector<int>
#define dos pair<int,int>
#define vedos vector<dos>
#define rand mt19937 rng(chrono::steady_clock::now().time_since_epoch().count())
struct greateri
{
    template<class T>
    bool operator()(T const &a, T const &b) const { return a > b; }
};
int n,v;
set<int>scrapes[30106];
vector<dos>scrapes1[30106];
int dist[30106];
void preprocess(int tower,int range)
{
  int weight=1;
  for (int i = tower+range; i < n; i+=range)
  {
    scrapes1[tower].pb({i,weight});
    weight++;
    if(scrapes[i].find(range)!=scrapes[i].end())break;
  }
  weight=1;
  for (int i = tower-range; i >= 0; i-=range)
  {
    scrapes1[tower].pb({i,weight});
    weight++;
    if(scrapes[i].find(range)!=scrapes[i].end())break;
  }
}
int start[30101],endi[30101];
int main()
{
  flash;
  cin>>n>>v;
  int rooto,dest;
  for (int i = 0; i < v; ++i)
  {
    int x,y;
    cin>>x>>y;
    start[i]=x,endi[i]=y;
    
    if(i==0)rooto=x;
    else if(i==1)dest=x;
  }
  for (int i = 0; i < v; ++i)
  {
    if(start[i]!=dest)
    scrapes[start[i]].insert(endi[i]);
  }
  for (int i = 0; i < n; ++i)
  {
    if(i!=dest)
      {for(auto it:scrapes[i])
        preprocess(i,it);}
  }
  for (int i = 0; i < n; ++i)
  {
    dist[i]=INF;
  }
  priority_queue<pair<int,int>,vector<pair<int,int>>,greater<pair<int,int>>>g;
  g.push({0,rooto});
  dist[rooto]=0;
  while(!g.empty())
  {
    auto u = g.top();
    auto tower = u.second;
    g.pop();
    if(dist[tower]<u.first)continue;
    if(tower==dest)break;
    for (auto k:scrapes1[tower])
    {
      if(dist[k.first]>u.first+k.second)
      {
        dist[k.first]=u.first+k.second;
        g.push({u.first+k.second,k.first});
      }
    }
  }
  int ans=INF;
  //debugs(rooto,dest);
  ans=min(ans,dist[dest]);
  if(ans==INF)cout<<-1;
  else cout<<ans;
  return 0;
}
//code the AC sol !
// BS/queue/map

Compilation message (stderr)

skyscraper.cpp: In function 'int main()':
skyscraper.cpp:81:5: warning: 'dest' may be used uninitialized in this function [-Wmaybe-uninitialized]
     if(tower==dest)break;
     ^~
skyscraper.cpp:74:14: warning: 'rooto' may be used uninitialized in this function [-Wmaybe-uninitialized]
   dist[rooto]=0;
   ~~~~~~~~~~~^~

• Subtask 1: 10 / 10
• Subtask 2: 12 / 12
• Subtask 3: 14 / 14
• Subtask 4: 21 / 21
• Subtask 5: 43 / 43