Submission #255380

#	Time	Username	Problem	Language	Result	Execution time	Memory
255380		uacoder123	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	4 ms	4992 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];
vector<ii> lis[100001];
int vis[100001],vis1[100001],ans[100001];
int r;
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(int j=0;j<lis[al[node][i]].size();++j)
        lis[node].pb(mp(1+lis[al[node][i]][j].F,lis[al[node][i]][j].S));
    }
  lis[node].pb(mp(0,node));
  sort(all(lis[node]),greater<ii>());
  while(lis[node].size()>r)
    lis[node].pop_back();
}
void dfs1(int node)
{
  ans[node]=0;
  for(int i=0;i<al[node].size();++i)
  {
    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;
  r=sqrt(n);
  for(int i=0;i<m;++i)
  {
    int f,s;
    cin>>f>>s;
    al[s].pb(f);
  }
  for(int i=n-1;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(int j=0;j<lis[s].size();++j)
        if(vis[lis[s][j].S]==0)
        {
          an=lis[s][j].F;
          break;
        }
    }
    else
    {
      dfs1(s);
      an=ans[s];
    }
    for(int j=0;j<v.size();++j)
        vis[v[j]]=0;
      v.clear();
    cout<<an<<endl;
  }
  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:28:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int j=0;j<lis[al[node][i]].size();++j)
                   ~^~~~~~~~~~~~~~~~~~~~~~~~
bitaro.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
   while(lis[node].size()>r)
         ~~~~~~~~~~~~~~~~^~
bitaro.cpp: In function 'void dfs1(int)':
bitaro.cpp:39:16: 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:78:20: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]
       for(int j=0;j<lis[s].size();++j)
                   ~^~~~~~~~~~~~~~
bitaro.cpp:90:18: 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