제출 #871660

#	제출 시각	아이디	문제	언어	결과	실행 시간	메모리
871660		AmirAli_H1	조이터에서 친구를 만드는건 재밌어 (JOI20_joitter2)	C++17	100 / 100	701 ms	123928 KiB

joitter2

// In the name of Allah
 
#include <bits/stdc++.h>
using namespace std;
 
typedef 	long long int			ll;
typedef 	long double				ld;
typedef 	pair<int, int>			pii;
typedef 	pair<ll, ll>			pll;
 
#define 	all(x)					(x).begin(),(x).end()
#define 	len(x)					((ll) (x).size())
#define 	F						first
#define 	S						second
#define 	pb						push_back
#define 	sep						' '
#define 	endl					'\n'
#define 	Mp						make_pair
#define 	kill(x)					cout << x << '\n', exit(0)
#define 	set_dec(x)				cout << fixed << setprecision(x);
#define 	file_io(x,y)			freopen(x, "r", stdin); freopen(y, "w", stdout);
 
int n, q;
const int maxn = 4e5 + 4;
bool mark[maxn]; queue<int> qu;
int p[maxn]; ll val[maxn]; vector<pii> E;
vector<int> ls[maxn]; set<int> A[maxn];
set<int> adj[maxn], adjr[maxn]; ll res = 0;
 
ll cal(ll sz, ll t) {
	return (sz * t) + sz * (sz - 1);
}
 
void upd(int a) {
	res -= val[a];
	val[a] = cal(len(ls[a]), len(A[a]));
	res += val[a];
}

int get(int a) {
	return p[a];
}

bool ok(int a, int b) {
	a = get(a); b = get(b);
	if (a != b && adj[a].find(b) != adj[a].end() && adj[b].find(a) != adj[b].end()) return 1;
	return 0;
}
 
void merge(int a1, int b1) {
	qu.push(b1); mark[b1] = 1;
	
	while (!qu.empty()) {
		int b1 = qu.front(); mark[b1] = 0;
		qu.pop();
		
		int a = get(a1), b = get(b1);
		if (a == b) continue;
		
		if (len(ls[a]) > len(ls[b])) swap(a, b);
		
		for (int v : A[a]) {
			if (p[v] == a || p[v] == b) continue;
			A[b].insert(v);
		}
		A[a].clear();
		
		for (int v : ls[a]) {
			p[v] = b; ls[b].pb(v);
			A[b].erase(v);
		}
		ls[a].clear();
		
		for (int v : adj[a]) {
			if (v == a || v == b) continue;
			adj[b].insert(v);
			adjr[v].erase(a); adjr[v].insert(b);
		}
		for (int v : adjr[a]) {
			if (v == a || v == b) continue;
			adjr[b].insert(v);
			adj[v].erase(a); adj[v].insert(b);
		}
		adj[b].erase(a); adjr[b].erase(a);
		
		for (int v : adj[a]) {
			if (ok(b, v) && !mark[v]) {
				qu.push(v); mark[v] = 1;
			}
		}
		for (int v : adjr[a]) {
			if (ok(b, v) && !mark[v]) {
				qu.push(v); mark[v] = 1;
			}
		}
		adj[a].clear(); adjr[a].clear();
		
		upd(a), upd(b);
	}
}
 
int main() {
	ios::sync_with_stdio(false); cin.tie(0); cout.tie(0);
	
	cin >> n >> q;
	for (int i = 0; i < n; i++) {
		p[i] = i; ls[i].pb(i);
	}
	
	for (int i = 0; i < q; i++) {
		int u1, v1;
		cin >> u1 >> v1; u1--; v1--;
		E.pb(Mp(u1, v1));
		
		int u = get(u1), v = get(v1);
		if (u == v) {
			cout << res << endl;
			continue;
		}
		
		A[v].insert(u1);
		upd(v);
		
		adj[u].insert(v); adjr[v].insert(u);
		if (ok(u, v)) merge(u, v);
		
		cout << res << endl;
	}
	
	return 0;
}

• Subtask 1: 1 / 1
• Subtask 2: 16 / 16
• Subtask 3: 83 / 83