Create PROBDIFF.java

Contests/August Long Challenge 2021 Division 3/Problem Difficulties (PROBDIFF)/PROBDIFF.java

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+import java.util.*;
+import java.lang.*;
+import java.io.*;
+
+public class Codechef {
+
+    public static void main(String[] args) throws Exception {
+        Scanner in = new Scanner(System.in);
+        int t = in.nextInt();
+        while (t-- > 0) {
+            HashMap < Integer, Integer > freq = new HashMap < Integer, Integer > ();
+            for (int i = 0; i < 4; i++) {
+                int a = in.nextInt();
+                if (!freq.containsKey(a)) {
+                    freq.put(a, 1);
+                } else {
+                    freq.put(a, freq.get(a) + 1);
+                }
+            }
+            System.out.println(pairs(freq));
+        }
+    }
+    private static int pairs(HashMap < Integer, Integer > freq) {
+        if (freq.containsValue(4))
+            return 0;
+        else if (freq.containsValue(3))
+            return 1;
+        else
+            return 2;
+
+    }
+}