7 - 8 파일 전송 (25 점)

#include
using namespace std;

typedef int* SetType;

int Find(SetType S,int X);
void Union(SetType S,int Root1,int Root2);
void Input_connection(SetType S);
void Check_connection(SetType S);
void Check_network(SetType S,int n);

int main(){
	SetType S;
	int n;char in;
	cin>>n;
	S = new int [n];
	for(int i = 0;i<n;i++){
		S[i] = -1;
	}
	
	do{
		cin>>in;
		switch(in){
			case 'I':Input_connection(S);break;
			case 'C':Check_connection(S);break;
			case 'S':Check_network(S,n);break;
		}
	}while(in!='S');
	delete(S);
	return 0;
}

int Find(SetType S,int X)
{
	if(S[X]<0){
		return X;
	}else{
		return  S[X] = Find(S,S[X]);
	}
}

void Union(SetType S,int Root1,int Root2){
	if(S[Root2]<S[Root1]){
		S[Root1] = Root2;
	}else{
		if(S[Root2]==S[Root1]){
			S[Root1]--;
		}
		S[Root2] = Root1;
	}
}

void Input_connection(SetType S)
{
	int u,v;
	int Root1,Root2;
	cin>>u>>v;
	
	Root1 = Find(S,u-1);
	Root2 = Find(S,v-1);
	if(Root1!=Root2){
		Union(S,Root1,Root2);
	}
}

void Check_connection(SetType S)
{
	int u,v;
	cin>>u>>v;
	int Root1,Root2;
	Root1 = Find(S,u-1);
	Root2 = Find(S,v-1);
	
	if(Root1==Root2){
		cout<<"yes"<<endl;
	}else{
		cout<<"no"<<endl;
	}
}

void Check_network(SetType S,int n)
{
	int i,counter = 0;
	for(i=0;i<n;i++){
		if(S[i]<0)counter++;
	}
	if(counter==1){
		cout<<"The network is connected."<<endl;
	}else{
		cout<<"There are "<<counter<<" components.
";
	}
}