Submission #549764

#	Time	Username	Problem	Language	Result	Execution time	Memory
549764		Soul234	Bosses (BOI16_bosses)	C++14	0 / 100	1 ms	488 KiB

bosses

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

void DBG() { cerr << "]\n"; }
template<class H, class... T> void DBG(H h, T... t) {
    cerr << h; if(sizeof...(t)) cerr << ", ";
    DBG(t...);
}
#ifdef LOCAL
#define dbg(...) cerr << "[" << #__VA_ARGS__ << "]: [", DBG(__VA_ARGS__)
#else
#define dbg(...) 0
#endif // LOCAL

#define FOR(i,a,b) for(int i = (a) ; i<(b) ; i++)
#define F0R(i,a) FOR(i,0,a)
#define ROF(i,a,b) for(int i = (b)-1 ; i>=(a) ; i--)
#define R0F(i,a) ROF(i,0,a)
#define each(e,a) for(auto &e : (a))
#define sz(v) (int)(v).size()
#define all(v) (v).begin(),(v).end()
#define rall(v) (v).rbegin(),(v).rend()
#define pb push_back
#define tcT template<class T
#define nl "\n"

using ll = long long;
using vi = vector<int>;
using pi = pair<int,int>;
using str = string;
tcT> using V = vector<T>;
tcT> using pqg = priority_queue<T,vector<T>,greater<T>>;

void setIO(string NAME = "") {
    cin.tie(0)->sync_with_stdio(0);
    if(sz(NAME)) {
        freopen((NAME + ".inp").c_str(),"r",stdin);
        freopen((NAME + ".out").c_str(),"w",stdout);
    }
}
const ll INF = 1e18;
tcT> bool ckmax(T&a, const T&b) {
    return b > a ? a = b,1 : 0;
}
tcT> bool ckmin(T&a, const T&b) {
    return b < a ? a = b,1 : 0;
}
const int MX = 5e3+5;
vi adj[MX], nadj[MX];
int N, dist[MX];
ll sum[MX], tot;

void dfs(int u) {
    sum[u] = 0;
    each(v, nadj[u]) {
        dfs(v);
        sum[u] += sum[v];
    }
    tot += (++sum[u]);
}

void solve() {
    cin>>N;
    FOR(i,1,N+1) {
        int k; cin>>k;
        while(k--) {
            int u; cin>>u;
            adj[u].pb(i);
        }
    }
    ll ans = INF;
    FOR(i,1,N+1) {
        FOR(i,1,N+1) nadj[i].clear();
        fill(dist, dist+N+1, -1);
        fill(sum, sum+N+1, 0);
        tot = 0;
        queue<int> q; dist[i] = 0;
        q.push(i);
        while(sz(q)) {
            int u = q.front(); q.pop();
            each(v, adj[u]) if(dist[v] == -1) {
                dist[v] = dist[u] + 1;
                nadj[u].pb(v);
                q.push(v);
            }
        }
        dfs(i);
        ckmin(ans, tot);
    }
    cout << ans << nl;
}

int main() {
    setIO();

    int t=1;
    //cin>>t;
    while(t-->0) {
        solve();
    }

    return 0;
}

Compilation message (stderr)

bosses.cpp: In function 'void setIO(std::string)':
bosses.cpp:37:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   37 |         freopen((NAME + ".inp").c_str(),"r",stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:38:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   38 |         freopen((NAME + ".out").c_str(),"w",stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

• Subtask 1: 0 / 22
• Subtask 2: 0 / 45
• Subtask 3: 0 / 33