Submission #928756

#	Time	Username	Problem	Language	Result	Execution time	Memory
928756		Baizho	Bosses (BOI16_bosses)	C++14	0 / 100	3 ms	12124 KiB

bosses

#include <bits/stdc++.h>
using namespace std;
#include <ext/pb_ds/assoc_container.hpp>
#include <ext/pb_ds/tree_policy.hpp>
using namespace __gnu_pbds;
  
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update>
 
 #pragma GCC optimize("Ofast,unroll-loops,fast-math")
 #pragma GCC target("popcnt")
 
 
typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll,ll> pll;
 
#define sz size()
#define ff first
#define ss second
#define all(a) a.begin(),a.end()
#define pb push_back
 
const int mod = ll(1e9)+7; //(b + (a%b)) % b (to mod -1%(10^9+7) correctly in c++ its -1 but its suppose to be 10^9+6
const ll MOD = 998244353;  // (a%mod)*(binpow(b,mod-2,mod) = (a/b)%mod
const int N = ll(1e5)+5;
const int M = ll(2e5) + 5;
const long long inf = 1e18;
const long double eps = 1e-15L;
 
ll lcm(ll a, ll b) { return (a / __gcd(a,b))*b; }
 
ll binpow(ll a, ll b, ll m) { ll res=1; a %= m; while(b>0){ if(b&1)res=(res * a) % m; a=(a * a) % m; b/=2; } return res%m;}
 
void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }

int n, siz[N];
vector<int> final[N];
set<int> g[N], boss[N];

void dfs(int v, int p = -1) {
	if(siz[v]) return;
	siz[v] = 1;
	for(auto to : final[v]) {
		dfs(to, v);
		siz[v] += siz[to];
	}
}

void Baizho() {
	cin>>n;
	for(int i = 1; i <= n; i ++) {
		int k; cin>>k;
		while(k --) {
			int b; cin>>b;
			g[b].insert(i);
			boss[i].insert(b);
		}
	}
	set<pair<int, int> > st;
	for(int i = 1; i <= n; i ++) {
		st.insert({g[i].size(), i});
	}
	while(!st.empty()) {
		int v = (*st.rbegin()).ss;
//		cout<<v<<endl;
		st.erase(--st.end());
		for(auto x : boss[v]) {
			st.erase({g[x].size(), x});
			if(g[x].size() > 1) st.insert({g[x].size() - 1, x});
			g[x].erase(v);
		}
		for(auto to : g[v]) {
			final[v].pb(to);
//			cout<<"to "<<v<<" "<<to<<" "<<g[v].size()<<endl;
			for(auto x : boss[to]) {
				if(x == v) continue;
				st.erase({g[x].size(), x});
				if(g[x].size() > 1) st.insert({g[x].size() - 1, x});
				g[x].erase(to);
			}
		}
		g[v].clear();
	}
	for(int i = 1; i <= n; i ++) dfs(i);
	long long ans = 0;
	for(int i = 1; i <= n; i ++) ans += siz[i];
	cout<<ans;
}
 
signed main() {		
// 	Freopen("nondec");
    ios_base::sync_with_stdio(false);   
    cin.tie(0);cout.tie(0); 
//   	precalc();
   	
    int ttt = 1;
//    cin>>ttt;
 
    for(int i=1; i<=ttt; i++) {Baizho(); }
}

Compilation message (stderr)

bosses.cpp: In function 'void Freopen(std::string)':
bosses.cpp:35:34: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                           ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
bosses.cpp:35:76: warning: ignoring return value of 'FILE* freopen(const char*, const char*, FILE*)' declared with attribute 'warn_unused_result' [-Wunused-result]
   35 | void Freopen(string Key){ freopen((Key+".in").c_str(), "r", stdin); freopen((Key+".out").c_str(), "w", stdout); }
      |                                                                     ~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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