Submission #414088

#	Time	Username	Problem	Language	Result	Execution time	Memory
414088		ignaciocanta	Bosses (BOI16_bosses)	C++14	67 / 100	1564 ms	936 KiB

bosses

#include <bits/stdc++.h>

using namespace std;

//#include <ext/pb_ds/assoc_container.hpp>
//using namespace __gnu_pbds;
//template<class T> using Tree = tree<T,null_type,less<T>,rb_tree_tag,tree_order_statistics_node_update>;
 
using tint = long long;
using ld = long double;
 
#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 trav(a,x) for (auto& a: x)	
 
using pi = pair<int,int>;
using pl = pair<tint,tint>;
using vi = vector<int>;
using vpi = vector<pi>;
using vpl = vector<pl>;
using vvi = vector<vi>;
using vl = vector<tint>;
using vb = vector<bool>;
 
#define pb push_back
#define pf push_front
#define rsz resize
#define all(x) begin(x), end(x)
#define rall(x) x.rbegin(), x.rend() 
#define sz(x) (int)(x).size()
#define ins insert
 
#define f first
#define s second
#define mp make_pair
 
#define DBG(x) cerr << #x << " = " << x << endl;
 
const int MOD = 1e9+7; 
const int mod = 998244353;
const int MX = 5005;
const tint INF = 1e18; 
const int inf = 2e8;
const ld PI = acos(ld(-1)); 
const ld eps = 1e-5;
 
const int dx[4] = {1, -1, 0, 0};
const int dy[4] = {0, 0, 1, -1};
 
template<class T> void remDup(vector<T> &v){ 
    sort(all(v)); v.erase(unique(all(v)),end(v));
}
 
template<class T> bool ckmin(T& a, const T& b) {
    return b < a ? a = b, 1 : 0; 
} 
template<class T> bool ckmax(T& a, const T& b) {
    return a < b ? a = b, 1 : 0; 
}
 
bool valid(int x, int y, int n, int m){
    return (0<=x && x<n && 0<=y && y<m);
}
 
int cdiv(int a, int b) { return a/b+((a^b)>0&&a%b); } //redondea p arriba
int fdiv(int a, int b) { return a/b-((a^b)<0&&a%b); } //redondea p abajo
 
void NACHO(string name = ""){
    ios_base::sync_with_stdio(0); cin.tie(0);
    if(sz(name)){
        freopen((name+".in").c_str(), "r", stdin);
        freopen((name+".out").c_str(), "w", stdout);
    }
}

vi adj[MX];
vi tree[MX];
bool vis[MX];
tint tot;
int n;
 
tint dfs(int node){
	vis[node] = 1;
	tint sumch = 0;
	trav(u, tree[node]){
		if(!vis[u]){
			sumch += dfs(u);
		}
	}
	tot += sumch+1;
	return sumch+1;
}

tint bfs(int node){
	queue<int> q; q.push(node);
	int visTot = 0;
	vis[node] = 1;
	while(sz(q)){
		auto u = q.front(); q.pop();
		++visTot;
		trav(v, adj[u]){
			if(!vis[v]){
				vis[v] = 1;
				tree[u].pb(v);
				q.push(v);
			}
		}
	}
	F0R(i, MX) vis[i] = 0;
	tot = 0; dfs(node);
	return visTot == n ? tot : INF;
}

int main(){
	NACHO();
	cin >> n;
	F0R(i, n){
		int k; cin >> k;
		F0R(assa, k){
			int x; cin >> x;
			adj[x-1].pb(i);
		}
	}
	tint ret = INF;
	F0R(i, n){
		F0R(j, n) vis[j] = 0;
		F0R(j, n) tree[j].clear();
		//cout << i+1 << " " << bfs(i) << endl;
		ckmin(ret, bfs(i));
	}
	cout << ret << "\n";
}
/*
4
1 4
3 1 3 4
2 1 2
1 3
*/ 

Compilation message (stderr)

bosses.cpp: In function 'void NACHO(std::string)':
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((name+".in").c_str(), "r", stdin);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:74:16: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   74 |         freopen((name+".out").c_str(), "w", stdout);
      |         ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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