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1717.cpp
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/****************
유니온 파인드!!!
ㅋ
******************/
#include <iostream>
using namespace std;
int parent[1000001];
int getParent(int x)
{
if (parent[x] == x)
return x;
else
return parent[x] = getParent(parent[x]);
//재귀함수를 통해 연결되있는 그래프에서의 가장 작은 vertex를 찾는다. 결국 이 vertex 값이 같다면 같은 그래프에 속한다고 할 수 있다.
}
void unionParent(int a, int b)
{
a = getParent(a);
b = getParent(b);
if (a < b)
parent[b] = a;
else if (a > b)
parent[a] = b;
//a와 b 중 더 작은 값을 상대의 부모에 넣게 된다.
}
int findParent(int a, int b)
{
a = getParent(a);
b = getParent(b);
if (a == b)
return 1;
else
return 0;
} //부모가 같다면 같은 그래프이기 때문에 1을 return하고 부모가 다르다면 다른 그래프이기 때문에 0을 return 한다.
int main()
{
ios::sync_with_stdio(false);
cin.tie(NULL);
cout.tie(NULL);
int N, M;
cin >> N >> M;
for (int i = 0; i <= N; i++)
{
parent[i] = i;
}
for (int i = 0; i < M; i++)
{
int op, a, b;
cin >> op >> a >> b;
if (op == 0)
{
unionParent(a, b);
}
else if (op == 1)
{
if (findParent(a, b))
cout << "yes";
else
cout << "NO";
}
}
}
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