Submission #1108279

#	Time	Username	Problem	Language	Result	Execution time	Memory
1108279		cuctuyetaz	Bosses (BOI16_bosses)	C++14	100 / 100	403 ms	14224 KiB

bosses

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

#define fi first
#define se second
#define endl '\n'
#define all(v) v.begin(), v.end()
#define GBIT(mask, i) (((mask) >> (i)) & 1)
#define BIT(i) (1ll << (i))
#define pb push_back

#define fu(i, l, r) for (int i = (int) (l); i <= (int)(r); i++)
#define fd(i, r, l) for (int i = (int) (r); i >= (int)(l); i--)

typedef long long ll;
typedef pair <int, int> pii;
typedef pair <ll, ll> pll;
typedef unsigned long long ull;
typedef double dl;

const int MAXN =5e5 + 55;
const ll MOD = 1e9 + 7;
const ll oo = 1ll * MOD * MOD;

int n;
vector <int> ke[MAXN];

void rf() {
    cin >> n;
    fu(i, 1, n) {
        int k, u;
        cin >> k;
        while (k--) {
            cin >> u;
            ke[u].pb(i);
        }
    }
}

int dist[MAXN];

void solve() {
    ll res = oo;
    fu(i, 1, n) {
        queue <int> p;
        int cursize = 0;
        fu(j, 1, n) dist[j] = 0;
        dist[i] = 1;
        p.push(i);
        ll ans = 0;
        while (p.size()) {
            int u = p.front();
            cursize++;
            ans += dist[u];
            p.pop();
            for (int v : ke[u]) if (dist[v] == 0) {
                    dist[v] = dist[u] + 1;
                    p.push(v);
            }
        }
        if (cursize == n) res = min(res, ans);
    }
    cout << res << endl;
}

int32_t main() {
    ios_base::sync_with_stdio(0); cin.tie(0); cout.tie(0);

    #define task "xD"

    if (fopen(task".inp", "r")) {
        freopen(task".inp", "r", stdin);
        freopen(task".out", "w", stdout);
    }

    int ntest = 1;
//    cin >> ntest;
    fu(i, 1, ntest) {
        rf();
        solve();
    }

    cerr << "\nTime : " << 1.0 * clock() / CLOCKS_PER_SEC << " ms \n";
    return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'int32_t main()':
bosses.cpp:72:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   72 |         freopen(task".inp", "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:73:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   73 |         freopen(task".out", "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~

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