Submission #310819

#	Time	Username	Problem	Language	Result	Execution time	Memory
310819		VROOM_VARUN	Bosses (BOI16_bosses)	C++14	100 / 100	792 ms	760 KiB

bosses

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

#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


int n;
VVI adj;

void init() {
  adj.resize(n);
}

int calc(int root) {
  VI dist(n, -1);
  dist[root] = 1;
  
  queue<int> q;
  q.push(root);

  while(!q.empty()) {
    int u = q.front();
    q.pop();
    for(auto& x: adj[u]) {
      if(dist[x] != -1) continue;
      dist[x] = dist[u] + 1;
      q.push(x);
    }
  }

  int mn = *min_element(all(dist));
  if(mn == -1) return INF;

  return accumulate(all(dist), 0);

}

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

  cin >> n;

  init();

  for(int i = 0; i < n; i++) {
    int cnt;
    cin >> cnt;
    while(cnt--) {
      int u;
      cin >> u;
      u--;
      adj[u].PB(i);
    }
  }

  int ret = INF;

  for(int i = 0; i < n; i++) {
    ret = min(ret, calc(i));
  }

  cout << ret << '\n';

  return 0;
}

• Subtask 1: 22 / 22
• Subtask 2: 45 / 45
• Subtask 3: 33 / 33