Submission #255447

#	Time	Username	Problem	Language	Result	Execution time	Memory
255447		uacoder123	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	31 ms	15104 KiB

bitaro

#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 long long int lli;
typedef pair <lli,lli> ii;
typedef pair <lli,ii> iii;
typedef vector <lli> vi;
vi al[100001];
set<ii> lis[100001];
int vis[100001],vis1[100001],ans[100001];
int r=700;
void dfs(int node)
{
  vis1[node]=1;
  for(int i=0;i<al[node].size();++i)
  {
    if(!vis1[al[node][i]])
    {
      dfs(al[node][i]);
    }
      for(auto j=(lis[al[node][i]].begin());j!=lis[al[node][i]].end();++j)
      {
        lis[node].insert(mp(1+(*j).F,(*j).S));
        if(lis[node].size()>r)
          lis[node].erase(lis[node].begin());
      }
    }
    if(lis[node].size()<r)
      lis[node].insert(mp(0,node));
}
void dfs1(int node)
{
  ans[node]=0;
  vis1[node]=1;
  for(int i=0;i<al[node].size();++i)
  {
    if(vis1[al[node][i]]==0)
    {
      dfs1(al[node][i]);
    }
      ans[node]=max(ans[node],1+ans[al[node][i]]);
  }
  if(ans[node]==0&&vis[node]==1)
    ans[node]=-1;
}
int main()
{
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int n,m,q;
  cin>>n>>m>>q;
  for(int i=0;i<m;++i)
  {
    int f,s;
    cin>>f>>s;
    al[s].pb(f);
  }
  for(int i=n;i>0;--i)
    if(vis1[i]==0)
      dfs(i);
  vi v;
  for(int i=0;i<q;++i)
  {
    int s,no;
    cin>>s>>no;
    int an=-1;
    for(int j=0;j<no;++j)
      {
        int f;
        cin>>f;
        vis[f]=1;
        v.pb(f);
      }
    if(no<r)
    {
      for(auto j=lis[s].begin();j!=lis[s].end();++j)
      {
        if(vis[(*j).S]==0)
        {
          an=(*j).F;
          break;
        }
      } 
         }
    else
    {
      memset(vis1,0,sizeof(vis1));
      dfs1(s);
      an=ans[s];
    }
    for(int j=0;j<v.size();++j)
        vis[v[j]]=0;
      v.clear();
    cout<<an<<'\n';
  }
  return 0;
}

Compilation message (stderr)

bitaro.cpp: In function 'void dfs(int)':
bitaro.cpp:24:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<al[node].size();++i)
               ~^~~~~~~~~~~~~~~~
bitaro.cpp:33:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
         if(lis[node].size()>r)
            ~~~~~~~~~~~~~~~~^~
bitaro.cpp:37:24: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     if(lis[node].size()<r)
        ~~~~~~~~~~~~~~~~^~
bitaro.cpp: In function 'void dfs1(int)':
bitaro.cpp:44:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   for(int i=0;i<al[node].size();++i)
               ~^~~~~~~~~~~~~~~~
bitaro.cpp: In function 'int main()':
bitaro.cpp:100:18: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
     for(int j=0;j<v.size();++j)
                 ~^~~~~~~~~

• Subtask 1: 0 / 7
• Subtask 2: 0 / 7
• Subtask 3: 0 / 86