Submission #244624

#	Time	Username	Problem	Language	Result	Execution time	Memory
244624		uacoder123	Jakarta Skyscrapers (APIO15_skyscraper)	C++14	10 / 100	108 ms	164860 KiB

skyscraper

#include <bits/stdc++.h>
using namespace std;
#define F first
#define S second
#define FOR(i,a,b) for (auto i = (a); i <= (b); ++i)
#define NFOR(i,a,b) for(auto i = (a); i >= (b); --i)
#define all(x) (x).begin(), (x).end()
#define sz(x) int(x.size())
#define mp(i,a) make_pair(i,a)
#define pb(a) push_back(a)
#define bit(x,b) (x&(1LL<<b))
 
typedef int lli;
typedef pair <lli,lli> ii;
typedef pair <lli,ii> iii;
typedef vector <lli> vi;
vector<ii> al[6*1000000];
int dis[6000000];
set<ii> s;
int dij(int so,int t)
{
  for(int i=0;i<6000000;++i)
    dis[i]=1000000000;
  s.insert(mp(0,so));
  while(s.size()!=0)
  {
    ii v=(*s.begin());
    s.erase(s.begin());
    dis[v.S]=v.F;
    for(int i=0;i<al[v.S].size();++i)
    {
      if(al[v.S][i].S+v.F<dis[al[v.S][i].F])
      {
       s.erase(mp(dis[al[v.S][i].F],al[v.S][i].F));
       dis[al[v.S][i].F]=al[v.S][i].S+v.F;
       s.insert(mp(dis[al[v.S][i].F],al[v.S][i].F)); 
      }
    }
  }
  if(dis[t]==1000000000)
    return(-1);
  return(dis[t]);
}
int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  lli test=1;
  for(;test>0;--test)
  {
    int n,m,rn;
    cin>>n>>m;
    rn=sqrt(n)+1;
    ii dg[m];
    for(int i=1;i<rn;++i)
    {
      for(int j=0;j<n;++j)
      {
        if(j+i<n)
        {
          al[i*n+j].pb(mp(i*n+j+i,1));
          al[i*n+j+i].pb(mp(i*n+j,1));
        }
        if(j+i<n)
          al[i*n+j].pb(mp(rn*n+j+i,1));
        if(j-i>=0)
          al[i*n+j].pb(mp(rn*n+j-i,1));
      }
    }
    for(int i=0;i<m;++i)
    {
      int f,s;
      cin>>f>>s;
      dg[i]=mp(f,s);
      if(s<rn)
        al[rn*n+f].pb(mp((s)*n+f,0));
      else
      {
        int p=f+s;
        while(p<n)
        {
          al[rn*n+f].pb(mp(rn*n+p,(p-f)/s));
          p+=s;
        }
        p=f-s;
        while(p>=0)
        {
          al[rn*n+f].pb(mp(rn*n+p,(f-p)/s));
          p-=s;
        }
      }
    }
    cout<<dij(dg[0].S*n+dg[0].F,dg[1].S*n+dg[1].F)<<endl;
  }
  return(0);
}

Compilation message (stderr)

skyscraper.cpp: In function 'int dij(int, int)':
skyscraper.cpp:30:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int i=0;i<al[v.S].size();++i)
                 ~^~~~~~~~~~~~~~~

• Subtask 1: 10 / 10
• Subtask 2: 0 / 12
• Subtask 3: 0 / 14
• Subtask 4: 0 / 21
• Subtask 5: 0 / 43