From e7a2c2d95e6e814d985c0715813449ecda99812f Mon Sep 17 00:00:00 2001
From: Tanmay-312 <jain2002tj@gmail.com>
Date: Sun, 21 Apr 2024 07:51:54 +0530
Subject: [PATCH] Added codes for 21 April

---
 GeeksForGeeks/April/21-4-24/GFG.java  | 108 ++++++++++++++++++++++++++
 GeeksForGeeks/April/21-4-24/README.md |   2 +
 LeetCode/April/21-4-24/README.md      |   2 +
 LeetCode/April/21-4-24/Solution.java  |  52 +++++++++++++
 4 files changed, 164 insertions(+)
 create mode 100644 GeeksForGeeks/April/21-4-24/GFG.java
 create mode 100644 GeeksForGeeks/April/21-4-24/README.md
 create mode 100644 LeetCode/April/21-4-24/README.md
 create mode 100644 LeetCode/April/21-4-24/Solution.java

diff --git a/GeeksForGeeks/April/21-4-24/GFG.java b/GeeksForGeeks/April/21-4-24/GFG.java
new file mode 100644
index 0000000..bf041cd
--- /dev/null
+++ b/GeeksForGeeks/April/21-4-24/GFG.java
@@ -0,0 +1,108 @@
+//{ Driver Code Starts
+//Initial Template for Java
+
+import java.io.*;
+import java.util.*;
+
+class GFG{
+    public static void main(String[] args)throws IOException {
+        BufferedReader read= new BufferedReader(new InputStreamReader(System.in));
+        int t  =Integer.parseInt(read.readLine());
+         
+        while(t-->0)
+        {
+            int N = Integer.parseInt(read.readLine());
+            int array[] = new int[N];
+            Map<Integer, Integer> mp = new HashMap<>();
+            
+            String input_line[] = read.readLine().trim().split(" ");
+            for(int i=0;i<N;i++)
+            {
+                array[i] = Integer.parseInt(input_line[i]);
+                if (mp.containsKey(array[i]))  
+                { 
+                    mp.put(array[i], mp.get(array[i]) + 1); 
+                }  
+                else
+                { 
+                    mp.put(array[i], 1); 
+                } 
+            }
+            
+            input_line = read.readLine().trim().split(" ");
+            int a = Integer.parseInt(input_line[0]);
+            int b = Integer.parseInt(input_line[1]);
+        
+            int original[] = new int[N];
+            
+            for(int i=0; i<N;i++)
+            {
+                original[i] = array[i];
+            }
+
+            int k1=0,k2=0,k3=0;
+            int kk1=0;int kk2=0;int kk3=0;
+
+            for(int i=0;i<N;i++)
+            {
+                if(original[i]>b)
+                    k3++;
+                else if(original[i]<=b && original[i]>=a)
+                    k2++;
+                else if(original[i]<b)
+                    k1++;
+            }
+            Solution ob = new Solution();
+            ob.threeWayPartition(array,a,b);
+
+            for(int i=0;i<k1;i++)
+            {
+                if(array[i]<b)
+                kk1++;
+            }
+            
+            for(int i=k1;i<k1+k2;i++)
+            {
+                if(array[i]<=b && array[i]>=a)
+                kk2++;
+                
+            }
+            
+            for(int i=k1+k2;i<k1+k2+k3;i++)
+            {
+                if(array[i]>b)
+                kk3++;
+            }
+            Boolean ok = false;
+            if(k1==kk1 && k2 ==kk2 && k3 == kk3)
+                ok = true;
+
+            for(int i=0;i<array.length;i++)
+                mp.put(array[i], mp.get(array[i]) - 1);
+            
+            for(int i=0;i<array.length;i++)
+                if(mp.get(array[i])!=0)
+                    ok=false;
+            
+            if(ok)
+                System.out.println(1);
+            else
+                System.out.println(0);
+        }
+    }
+}
+
+// } Driver Code Ends
+
+
+//User function Template for Java
+
+class Solution{
+    //Function to partition the array around the range such 
+    //that array is divided into three parts.
+    public void threeWayPartition(int array[], int a, int b)
+    {
+        // code here
+        Arrays.sort(array);
+    }
+}
diff --git a/GeeksForGeeks/April/21-4-24/README.md b/GeeksForGeeks/April/21-4-24/README.md
new file mode 100644
index 0000000..3148109
--- /dev/null
+++ b/GeeksForGeeks/April/21-4-24/README.md
@@ -0,0 +1,2 @@
+Time complexity - O(|sort|)
+Space complexity - O(|sort|)
diff --git a/LeetCode/April/21-4-24/README.md b/LeetCode/April/21-4-24/README.md
new file mode 100644
index 0000000..7384c4b
--- /dev/null
+++ b/LeetCode/April/21-4-24/README.md
@@ -0,0 +1,2 @@
+Time complexity - O(n)
+Space complexity - O(n)
diff --git a/LeetCode/April/21-4-24/Solution.java b/LeetCode/April/21-4-24/Solution.java
new file mode 100644
index 0000000..30aed78
--- /dev/null
+++ b/LeetCode/April/21-4-24/Solution.java
@@ -0,0 +1,52 @@
+class UnionFind 
+{
+    public UnionFind(int n) 
+    {
+        id = new int[n];
+        rank = new int[n];
+        for (int i = 0; i < n; ++i)
+            id[i] = i;
+    }
+
+    public void unionByRank(int u, int v) 
+    {
+        int i = find(u);
+        int j = find(v);
+        if (i == j)
+            return;
+        if (rank[i] < rank[j])
+            id[i] = j;
+        else if (rank[i] > rank[j])
+            id[j] = i;
+        else
+        {
+            id[i] = j;
+            ++rank[j];
+        }
+    }
+
+    public int find(int u) 
+    {
+        return id[u] == u ? u : (id[u] = find(id[u]));
+    }
+
+    private int[] id;
+    private int[] rank;
+}
+
+class Solution 
+{
+    public boolean validPath(int n, int[][] edges, int source, int destination) 
+    {
+        UnionFind uf = new UnionFind(n);
+
+        for (int[] edge : edges) 
+        {
+            int u = edge[0];
+            int v = edge[1];
+            uf.unionByRank(u, v);
+        }
+
+        return uf.find(source) == uf.find(destination);
+    }
+}