Submission #520422

#	Time	Username	Problem	Language	Result	Execution time	Memory
520422		new_acc	Making Friends on Joitter is Fun (JOI20_joitter2)	C++14	0 / 100	1208 ms	1048580 KiB

joitter2

#include<bits/stdc++.h>
#define fi first
#define se second
#define rep(a, b) for(int a = 0; a < (b); a++)
using namespace std;
typedef long long ll;
typedef vector<ll> vi;
typedef vector<ll> vl;
const int N=1e5+10;
vi f[N];
int fau[N];
ll w[N];
set<int> ini[N];
set<int> outi[N];
set<int> ini2[N];
ll res;
vi Union(int a,int b){
	res-=(ll)(f[a].size())*(ll)(f[a].size()-1);
	res-=(ll)(f[b].size())*(ll)(f[b].size()-1);
	a=fau[a],b=fau[b];
	vi p;
	if(f[a].size()>f[b].size()) swap(a,b);
	rep(i,f[a].size()){
		fau[f[a][i]]=b,f[b].push_back(f[a][i]);
		auto it=ini2[b].lower_bound(f[a][i]);
		if(it!=ini2[b].end() and (*it)==f[a][i]) ini2[b].erase(f[a][i]);
	}
	f[a].clear();
	for(auto it=ini2[a].begin();it!=ini2[a].end();it++) if(fau[(*it)]!=b) ini2[b].insert(*it);
	ini2[a].clear();
	for(auto it=ini[a].begin();it!=ini[a].end();it++){
		auto it2=outi[b].lower_bound(*it);
		if(it2!=outi[b].end() and *it2==*it) p.push_back(*it2);
	}
	for(auto it=outi[a].begin();it!=outi[a].end();it++){
		auto it2=ini[b].lower_bound(*it);
		if(it2!=ini[b].end() and *it==*it2) p.push_back(*it2);
	}
	for(auto it=ini[a].begin();it!=ini[a].end();it++){
		if((*it)!=b){
			outi[*it].erase(a);
			outi[*it].insert(b);
		}
	}
	for(auto it=outi[a].begin();it!=outi[a].end();it++){
		if((*it)!=b){
			ini[*it].erase(a);
			ini[*it].insert(b);
		}
	}
	for(auto it=ini[a].begin();it!=ini[a].end();it++) if(*it!=b) ini[b].insert(*it);
	for(auto it=outi[a].begin();it!=outi[a].end();it++) if(*it!=b) outi[b].insert(*it);
	outi[b].erase(a),ini[b].erase(a);
	ini[a].clear(),outi[a].clear();
	res-=w[a],res-=w[b];
	w[b]=(ll)(ini2[b].size())*(ll)(f[b].size());
	res+=w[b];
	res+=(ll)(f[b].size())*(ll)(f[b].size()-1);
	return p;
}
void solve(){
	int n,q;
	cin>>n>>q;
	for(int i=1;i<=n;i++) fau[i]=i,f[i].push_back(i);
	rep(i,q){
		int a,b;
		cin>>a>>b;
		b=fau[b];
		auto it2=ini2[b].lower_bound(a);
		if((it2!=ini2[b].end() and (*it2)==a) or fau[a]==b){cout<<res<<"\n";continue;}
		ini2[b].insert(a);
		a=fau[a];	
		res-=w[b];
		outi[a].insert(b),ini[b].insert(a);
		w[b]=(ll)(ini2[b].size())*(ll)(f[b].size());
		res+=w[b];
		auto it=outi[b].lower_bound(a);
		if(it==outi[b].end() or (*it)!=a){cout<<res<<"\n"; continue;}
		vi xd=Union(a,b);
		int v=fau[a];
		while(xd.size()){
			vi pom=Union(v,xd.back());
			xd.pop_back();
			rep(j,pom.size()) xd.push_back(pom[j]);
			v=fau[v];
		}
		cout<<res<<"\n";
	}
}
int main(){
	ios_base::sync_with_stdio(0),cin.tie(0);
	solve();
}

Compilation message (stderr)

joitter2.cpp: In function 'vi Union(int, int)':
joitter2.cpp:4:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define rep(a, b) for(int a = 0; a < (b); a++)
      |                                    ^
joitter2.cpp:23:2: note: in expansion of macro 'rep'
   23 |  rep(i,f[a].size()){
      |  ^~~
joitter2.cpp: In function 'void solve()':
joitter2.cpp:4:36: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<long long int>::size_type' {aka 'long unsigned int'} [-Wsign-compare]
    4 | #define rep(a, b) for(int a = 0; a < (b); a++)
      |                                    ^
joitter2.cpp:84:4: note: in expansion of macro 'rep'
   84 |    rep(j,pom.size()) xd.push_back(pom[j]);
      |    ^~~

• Subtask 1: 0 / 1
• Subtask 2: 0 / 16
• Subtask 3: 0 / 83