This submission is migrated from previous version of oj.uz, which used different machine for grading. This submission may have different result if resubmitted.
#include <bits/stdc++.h>
using namespace std;
map<long long,long long> sumas;
vector<vector<int>> V;
vector<vector<int>> R;
long long con1=0;
int N;
void Init(int N){
vector<int> V1(N,0);
vector<int> J;
for(int i=0;i<N;i++){
V.push_back(V1);
R.push_back(J);
}
}
void Link(int A,int B){
R[A].push_back(B);
R[B].push_back(A);
V[A][B]=1;
V[B][A]=1;
sumas[A]++;
sumas[B]++;
}
void cadena(int i,int j,vector<int> visitados){
visitados[j]=1;
if(V[i][j]==1){
if(sumas[j]==2){
con1++;
}
}else{
if(sumas[j]==1){
con1++;
}
}
int jaja=R[j].size();
for(int k=0;k<jaja;k++){
if(visitados[R[j][k]]==0 && R[j][k]!=i){
cadena(i,R[j][k],visitados);
}
}
}
int CountCritical(){
long long res=0;
for(int i=0;i<N;i++){
bool com=true;
for(int j=0;j<N;j++){
if(i!=j){
if(V[i][j]==1){
if(sumas[j]==1){
continue;
}else if(sumas[j]>3){
com=false;
break;
}
}else{
if(sumas[j]==0){
continue;
}else if(sumas[j]>2){
com=false;
break;
}else{
vector<int> visitados(N,0);
con1=0;
cadena(i,j,visitados);
if(con1!=2){
com=false;
break;
}
}
}
}
}
if(com){
res++;
}
}
return res;
}
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