洛谷P1551亲戚(java,并查集)-创新互联
若某个家族人员过于庞大,要判断两个是否是亲戚,确实还很不容易,现在给出某个亲戚关系图,求任意给出的两个人是否具有亲戚关系。
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链接:https://www.luogu.com.cn/problem/P1551
代码实现:
import java.util.*;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int n = sc.nextInt();
int m = sc.nextInt();
int p = sc.nextInt();
UnionFind unionFind = new UnionFind(n);
for (int i = 0; i< m; i++) {
int x = sc.nextInt();
int y = sc.nextInt();
unionFind.union(x, y);
}
for (int i = 0; i< p; i++) {
int x = sc.nextInt();
int y = sc.nextInt();
boolean flag = unionFind.isSameSet(x, y);
if (flag) {
System.out.println("Yes");
} else {
System.out.println("No");
}
}
}
}
class UnionFind {
HashMapfather;
public UnionFind (int n) {
father = new HashMap<>();
for (int i = 1; i<= n; i++) {
father.put(i, null);
}
}
public int findFather (int x) {
int root = x;
//找祖先
while (father.get(root) != null) {
root = father.get(root);
}
//压缩路径
while (x != root) {
int original_father = father.get(x);
father.put(x,root);
x = original_father;
}
return root;
}
//合并
public void union(int x, int y) {
int rootX = findFather(x);
int rootY = findFather(y);
if (rootX != rootY) {
father.put(rootX, rootY);
}
}
public boolean isSameSet(int x, int y) {
return findFather(x) == findFather(y);
}
}
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