Submission #567309

#	Time	Username	Problem	Language	Result	Execution time	Memory
567309		Uzouf	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	4 ms	6740 KiB

bitaro

#include <bits/stdc++.h>
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace std;
using namespace __gnu_pbds;
#define int long long
#define endl "\n"
int mod=1e9+7;
const int N=1e5+5;
template<class x>
using ordered_multiset = tree<x, null_type,less_equal<x>, rb_tree_tag,tree_order_statistics_node_update>;

int n,m,t;
vector<vector<int> > v(N),vv(N);
vector<int> topo;
int ans[N],par[N];
bool vis[N];

void dfs(int i) {
  vis[i]=true;
  for (int j:vv[i]) {
    par[j]=i;
    if (!vis[j]) {
      dfs(j);
    }
  }
  topo.push_back(i);
}

signed main()
{
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);
    //freopen(".in", "r", stdin); freopen(".out", "w", stdout);

    cin>>n>>m>>t;
    for (int i=0;i<m;i++) {
      int a,b; cin>>a>>b;
      v[a].push_back(b);
      vv[b].push_back(a);
    }

    for (int tt=0;tt<t;tt++) {
      bool busy[N];
      memset(busy,false,sizeof busy);

      int plc; cin>>plc;
      int b; cin>>b;
      for (int i=0;i<b;i++) {
        int x; cin>>x; busy[x]=true;
      }

      topo.clear();
      for (int i=0;i<N;i++) {par[i]=i; vis[i]=false;}
      dfs(plc);
      reverse(topo.begin(),topo.end());
      memset(vis,false,sizeof vis);

      queue<int> q;
      int dis[N];
      for (int i=0;i<N;i++) dis[i]=0;

      for (int i:topo) {
        if (i==plc) continue;
        dis[i]=dis[par[i]]+1;
      }

      int cnt=-1;
      for (int i=1;i<=n;i++) {
        if (!busy[i]) cnt=max(cnt,dis[i]);
      }
      ans[tt]=cnt;
    }

    for (int i=0;i<t;i++) cout<<ans[i]<<endl;
}

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