Create solution.java

Disjoint Sets/Components in a graph/solution.java

@@ -0,0 +1,57 @@
+import java.io.*;
+import java.math.*;
+import java.text.*;
+import java.util.*;
+import java.util.regex.*;
+
+public class Solution {
+
+    public static void main(String args[]){
+        int[] parents = new int[30001];
+
+        Scanner sc = new Scanner(System.in);
+        int n = sc.nextInt();
+        int a, b;
+
+        while(n-->0){
+
+            a = sc.nextInt();
+            b = sc.nextInt();
+
+            if(parents[a] == 0) parents[a] = a;
+            if(parents[b] == 0) parents[b] = a;
+
+            //Disjoin set idea, keep updating the representative element of each set.
+            if(parents[a] != 0 || parents[b] != 0){
+                int low = Math.min(parents[a], parents[b]);
+                int high = Math.max(parents[a], parents[b]);
+                for(int i=0; i<parents.length; i++){
+                    if(parents[i] == high)
+                        //let representative always be the smallest in the set
+                        parents[i] = low;
+                }
+            }
+        }
+
+        //convert int[] to Integer[] in order to use Collections.frequency(Integer[], int)
+        Integer[] newArray = new Integer[parents.length];
+        int i = 0;
+        for (int value : parents) {
+            newArray[i++] = value;
+        }
+
+        List<Integer> ints = Arrays.asList(newArray);
+        int min = Integer.MAX_VALUE;
+        int max = Integer.MIN_VALUE;
+
+        for(int item : newArray) {
+            if(item != 0) {
+                int frequency = Collections.frequency(ints, item);
+                min = Math.min(min, frequency);
+                max = Math.max(max, frequency);
+            }
+        }
+        System.out.println(min + " " + max);
+    }
+
+}