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。
易县网站建设公司创新互联公司,易县网站设计制作,有大型网站制作公司丰富经验。已为易县1000+提供企业网站建设服务。企业网站搭建\成都外贸网站制作要多少钱,请找那个售后服务好的易县做网站的公司定做!附图(洛谷)
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);
}
}
你是否还在寻找稳定的海外服务器提供商?创新互联www.cdcxhl.cn海外机房具备T级流量清洗系统配攻击溯源,准确流量调度确保服务器高可用性,企业级服务器适合批量采购,新人活动首月15元起,快前往官网查看详情吧
文章标题:洛谷P1551亲戚(java,并查集)-创新互联
链接地址:http://lswzjz.com/article/dsiode.html