oj.uz

Submission #245419

# Submission time Handle Problem Language Result Execution time Memory
245419 2020-07-06T11:30:49 Z TadijaSebez Making Friends on Joitter is Fun (JOI20_joitter2) C++11
0 / 100
 15 ms 19072 KB 
#include <bits/stdc++.h>
using namespace std;
#define ll long long
const int N=100050;
set<int> in[N],all[N],E[N],R[N];
int my[N];
ll ans;
ll Calc(int cmp){
	return (ll)all[cmp].size()*((int)all[cmp].size()-1)+(ll)in[cmp].size()*all[cmp].size();
}
void Del(int cmp){
	ans-=Calc(cmp);
}
void Add(int cmp){
	ans+=Calc(cmp);
}
int main(){
	int n,m;scanf("%i %i",&n,&m);
	for(int i=1;i<=n;i++)all[i].insert(i),my[i]=i;
	set<pair<int,int>> edg;
	for(int i=1;i<=m;i++){
		int u,v;scanf("%i %i",&u,&v);
		if(E[my[v]].count(my[u])){
			int A=my[u],B=my[v];
			//printf("Mrg %i %i\n",A,B);
			Del(A);Del(B);
			E[B].erase(A);
			R[A].erase(B);
			if(all[A].size()+in[A].size()+E[A].size()+R[A].size()>all[B].size()+in[B].size()+E[B].size()+R[B].size())swap(A,B);
			for(int x:all[A]){
				if(in[B].count(x))in[B].erase(x);
				all[B].insert(x);
				my[x]=B;
			}
			all[A].clear();
			for(int x:in[A]){
				if(!all[B].count(x))in[B].insert(x);
			}
			in[A].clear();
			for(int x:E[A]){
				R[x].erase(A);
				if(!E[B].count(x)){
					E[B].insert(x);
					R[x].insert(B);
				}
			}
			E[A].clear();
			for(int x:R[A]){
				E[x].erase(A);
				if(!R[B].count(x)){
					R[B].insert(x);
					E[x].insert(B);
				}
			}
			R[A].clear();
			Add(B);
		}else{
			Del(my[v]);
			in[my[v]].insert(u);
			E[my[u]].insert(my[v]);
			R[my[v]].insert(my[u]);
			Add(my[v]);
		}
		edg.insert({u,v});
		printf("%lld\n",ans);
	}
	return 0;
}

Compilation message

joitter2.cpp: In function 'int main()':
joitter2.cpp:18:15: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
  int n,m;scanf("%i %i",&n,&m);
          ~~~~~^~~~~~~~~~~~~~~
joitter2.cpp:22:16: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result]
   int u,v;scanf("%i %i",&u,&v);
           ~~~~~^~~~~~~~~~~~~~~

Subtask #1
0 / 1.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 19072 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #2
0 / 16.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 19072 KB Output isn't correct
2 Halted 0 ms 0 KB -

Subtask #3
0 / 83.0

# Verdict Execution time Memory Grader output
1 Incorrect 15 ms 19072 KB Output isn't correct
2 Halted 0 ms 0 KB -