Submission #1215173

#	Time	Username	Problem	Language	Result	Execution time	Memory
1215173		mychecksedad	Bitaro’s Party (JOI18_bitaro)	C++20	100 / 100	1704 ms	483800 KiB

bitaro

/* Author : Mychecksdead  */
#include<bits/stdc++.h>
using namespace std;
#define ll long long int
#define MOD (1000000000+7)
#define MOD1 (998244353)
#define pb push_back
#define all(x) x.begin(), x.end()
#define en cout << '\n'
#define ff first
#define ss second
#define pii pair<int,int>
#define vi vector<int>
const int N = 1e6+100, M = 1e5+10, K = 52, MX = 30;


int n, m, q;
vi g[N], G[N];
vector<pii> T[N];
void solve(){
  cin >> n >> m >> q;
  for(int i = 1; i <= m; ++i){
    int u, v; cin >> u >> v;
    g[v].pb(u);
    G[u].pb(v);
  }
  for(int i = 1; i <= n; ++i){
    T[i].pb({0, i});
  }
  vector<bool> VIS(n+1);
  vi used;
  for(int i = 1; i <= n; ++i){
    for(int u: g[i]){
      vector<pii> P;
      int ptr = 0;
      for(int j = 0; j < T[i].size(); ++j){
        while(ptr < T[u].size() && T[u][ptr].ff + 1 >= T[i][j].ff){
          P.pb({T[u][ptr].ff + 1, T[u][ptr].ss});
          ++ptr;
        }
        P.pb(T[i][j]);
      }
      while(ptr < T[u].size()) {P.pb({T[u][ptr].ff + 1, T[u][ptr].ss}); ptr++;}
      T[i].clear();
      
      for(int j = 0; j < P.size() && T[i].size() <= 400; ++j){
        if(VIS[P[j].ss]) continue;
        T[i].pb(P[j]);
        used.pb(P[j].ss);
        VIS[P[j].ss] = 1;
      }
      for(int x: used) VIS[x] = 0;
      used.clear();
    }
  }
  vector<vi> Q(q + 1);
  vector<bool> bad(n + 1);
  for(int i = 1; i <= q; ++i){
    int y, v; cin >> v >> y;
    Q[i].resize(y);
    for(int &x: Q[i]){
      cin >> x;
      bad[x] = 1;
    }
    if(y >= 395){
      vi dp(n + 1, 0);
      for(int x: Q[i]) dp[x] = -MOD;
      for(int j = 1; j <= n; ++j){
        for(int u: G[j]) dp[u] = max(dp[u], dp[j] + 1);
      }
      cout << (dp[v] < 0 ? -1 : dp[v]) << '\n';
    }else{
      int ans = -1;
      for(auto [dist, x]: T[v]){
        if(!bad[x]){
          ans = dist;
          break;
        }
      }
      cout << ans << '\n';
    }
    for(int &x: Q[i]){
      bad[x] = 0;
    }
  }
}


int main(){
  cin.tie(0); ios::sync_with_stdio(0);
  int tt = 1, aa;
  // freopen("in.txt", "r", stdin);
  // freopen("out.txt", "w", stdout);
  while(tt--){
    solve();
    en;
  }
  cerr<<"time taken : "<<(float)clock()/CLOCKS_PER_SEC<<" seconds\n";
  return 0;
} 

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