Submission #329827

#	Time	Username	Problem	Language	Result	Execution time	Memory
329827		VROOM_VARUN	Bitaro’s Party (JOI18_bitaro)	C++14	0 / 100	2 ms	492 KiB

bitaro

/*
ID: varunra2
LANG: C++
TASK: bitaro
*/

#include <bits/stdc++.h>
using namespace std;

#ifdef DEBUG
#include "lib/debug.h"
#define debug(...) cerr << "[" << #__VA_ARGS__ << "]:", debug_out(__VA_ARGS__)
#define debug_arr(...) \
  cerr << "[" << #__VA_ARGS__ << "]:", debug_arr(__VA_ARGS__)
#pragma GCC diagnostic ignored "-Wsign-compare"
//#pragma GCC diagnostic ignored "-Wunused-parameter"
//#pragma GCC diagnostic ignored "-Wunused-variable"
#else
#define debug(...) 42
#endif

#define EPS 1e-9
#define IN(A, B, C) assert(B <= A && A <= C)
#define INF (int)1e9
#define MEM(a, b) memset(a, (b), sizeof(a))
#define MOD 1000000007
#define MP make_pair
#define PB push_back
#define all(cont) cont.begin(), cont.end()
#define rall(cont) cont.end(), cont.begin()
#define x first
#define y second

const double PI = acos(-1.0);
typedef long long ll;
typedef long double ld;
typedef pair<int, int> PII;
typedef map<int, int> MPII;
typedef multiset<int> MSETI;
typedef set<int> SETI;
typedef set<string> SETS;
typedef vector<int> VI;
typedef vector<PII> VII;
typedef vector<VI> VVI;
typedef vector<string> VS;

#define rep(i, a, b) for (int i = a; i < (b); ++i)
#define trav(a, x) for (auto& a : x)
#define sz(x) (int)(x).size()
typedef pair<int, int> pii;
typedef vector<int> vi;
#pragma GCC diagnostic ignored "-Wsign-compare"
// util functions

const int block = 3;
int n, m, q;
vector<bool> vis;
VVI adj;
vector<VII> vals;

VII comb(vector<VII>& chlds, int pos) {
  // the size of each vector is <= block
  int siz = sz(chlds);
  if (siz == 0) {
    return {MP(0, pos)};
  }
  priority_queue<pair<PII, int>> pq;
  VI ind(siz, 0);
  VII ret;
  map<int, bool> use;

  for (int i = 0; i < siz; i++) {
    pq.push(MP(chlds[i][0], i));
  }

  int cnt = 0;
  while (sz(ret) < block) {
    auto x = pq.top();
    pq.pop();
    if (!use[x.x.y]) {
      use[x.x.y] = true;
      ret.PB(MP(x.x.x + 1, x.x.y));
    }
    ind[x.y]++;
    if (ind[x.y] < sz(chlds[x.y])) {
      pq.push(MP(chlds[x.y][ind[x.y]], x.y));
    } else if (ind[x.y] == sz(chlds[x.y]))
      cnt++;

    if (cnt == siz) break;
  }
  ret.PB(MP(0, pos));
  return ret;
}

void init() {
  adj.resize(n);
  vals.resize(n);
  vis.assign(n, false);
}

void gen(int u) {
  if (vis[u]) return;
  vis[u] = true;
  vector<VII> chlds;
  for (auto& x : adj[u]) {
    gen(x);
    chlds.PB(vals[x]);
  }
  vals[u] = comb(chlds, u);
}

void preprocess() {
  for (int i = 0; i < n; i++) {
    if (!vis[i]) gen(i);
  }
}

void stupid(int u, VI& dist, vector<bool>& vis) {
  if (vis[u]) return;
  vis[u] = true;
  for (auto& x : adj[u]) {
    dist[x] = max(dist[x], dist[u] + 1);
    stupid(x, dist, vis);
  }
}

int main() {
  // #ifndef ONLINE_JUDGE
  // freopen("bitaro.in", "r", stdin);
  // freopen("bitaro.out", "w", stdout);
  // #endif
  cin.sync_with_stdio(0);
  cin.tie(0);

  cin >> n >> m >> q;

  init();

  for (int i = 0; i < m; i++) {
    int u, v;
    cin >> u >> v;
    u--, v--;
    adj[v].PB(u);
  }

  preprocess();

  while (q--) {
    int u, cnt;
    cin >> u >> cnt;
    u--;
    map<int, bool> bad;
    for (int i = 0; i < cnt; i++) {
      int v;
      cin >> v;
      v--;
      bad[v] = true;
    }
    if (cnt < block) {
      int ret = -1;
      for (int i = 0; i < sz(vals[u]) - 1; i++) {
        if (!bad[vals[u][i].y]) {
          ret = vals[u][i].x;
          break;
        }
      }
      if (!bad[u]) ret = max(ret, 0);
      cout << ret << '\n';
    } else {
      VI dist(n, -1);
      dist[u] = 0;
      vector<bool> vis(n, false);
      stupid(u, dist, vis);
      int ret = -1;
      for (int i = 0; i < n; i++) {
        if (bad[i]) continue;
        ret = max(ret, dist[i]);
      }
      cout << ret << '\n';
    }
  }

  return 0;
}

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