Language: Java

import java.io.*;
import java.math.*;
import java.security.KeyStore.Entry;
import java.util.*;

public class Main {
	private static boolean[] vis;
	private static long[] dist;
	public static void merge(int arr[], int l, int m, int r) 
    { 
        // Find sizes of two subarrays to be merged 
        int n1 = m - l + 1; 
        int n2 = r - m; 
  
        /* Create temp arrays */
        int L[] = new int [n1]; 
        int R[] = new int [n2]; 
  
        /*Copy data to temp arrays*/
        for (int i=0; i<n1; ++i) 
            L[i] = arr[l + i]; 
        for (int j=0; j<n2; ++j) 
            R[j] = arr[m + 1+ j]; 
  
  
        /* Merge the temp arrays */
  
        // Initial indexes of first and second subarrays 
        int i = 0, j = 0; 
  
        // Initial index of merged subarry array 
        int k = l; 
        while (i < n1 && j < n2) 
        { 
            if (L[i] <= R[j]) 
            { 
                arr[k] = L[i]; 
                i++; 
            } 
            else
            { 
                arr[k] = R[j]; 
                j++; 
            } 
            k++; 
        } 
  
        /* Copy remaining elements of L[] if any */
        while (i < n1) 
        { 
            arr[k] = L[i]; 
            i++; 
            k++; 
        } 
  
        /* Copy remaining elements of R[] if any */
        while (j < n2) 
        { 
            arr[k] = R[j]; 
            j++; 
            k++; 
        } 
    } 
	 public static void sort(int arr[], int l, int r) 
	    { 
	        if (l < r) 
	        { 
	            // Find the middle point 
	            int m = (l+r)/2; 
	  
	            // Sort first and second halves 
	            sort(arr, l, m); 
	            sort(arr , m+1, r); 
	  
	            // Merge the sorted halves 
	            merge(arr, l, m, r); 
	        } 
	    } 
	 private static int gcd(int n, int l) {
	        if (l == 0)
	            return n;
	        return gcd(l, n % l);
	    }
	 public static void dfs(ArrayList<Integer>[] gr,int v,int[] ans,HashMap<Integer,HashMap<Integer,Integer>> map)
	    {
	         vis[v]=true;
	         ArrayList<Integer> arr=gr[v];
	         for(int i=0;i<arr.size();i++)
	         {
	             if(!vis[arr.get(i)])
	             {  
	            	 
	            	 dfs(gr,arr.get(i));
	             }
	         }
	    }
	 private static class Pairs implements Comparable<Pairs>{
	        String v;int i;int j;
	        public Pairs(String a,int b,int c){
	            v=a;
	            i=b;
	            j=c;
	        }
	        @Override
	        public int compareTo(Pairs arg0) {
	            {
	            	if(!this.v.equals(arg0.v))
	            		return this.v.compareTo(arg0.v);
	            	else
	            		return arg0.i-this.i;
	            }
	        }
	    }
	 private static class Pair implements Comparable<Pair>{
	        int v,i;Pair j;
	        public Pair(int a,int b){
	            v=a;
	            i=b;
	        }
	        public Pair(int a,Pair b)
	        {
	            v=a;
	            j=b;
	        }
	        @Override
	        public int compareTo(Pair arg0) {
	            {
	            	return this.v-arg0.v;
	            }
	        }
	    }
	 public static long mmi(long a, long m) 
	    { 
	        long m0 = m; 
	        long y = 0, x = 1; 
	      
	        if (m == 1) 
	          return 0; 
	      
	        while (a > 1) 
	        { 
	            // q is quotient 
	            long q = a / m; 
	            long t = m; 
	      
	            // m is remainder now, process same as 
	            // Euclid's algo 
	            m = a % m; a = t; 
	            t = y; 
	      
	            // Update y and x 
	            y = x - q * y; 
	            x = t; 
	        } 
	      
	        // Make x positive 
	        if (x < 0) 
	           x += m0; 
	      
	        return x; 
	    }
	public static void main(String[] args) throws Exception
	{
		Scanner sc=new Scanner(System.in);
	    int n=sc.nextInt();
	    ArrayList<Integer>[] g=new ArrayList[n+1];
	    for(int i=01;i<=n;i++)	g[i]=new ArrayList<>();
	    for(int i=0;i<n-1;i++)
	    {
	    	int a=sc.nextInt();int b=sc.nextInt();
	    	g[a].add(b);g[b].add(a);
	    }
	    int[] c=new int[n];
	    for(int i=0;i<n;i++)	c[i]=sc.nextInt();
	    int[] ans=new int[n+1];
	    sort(c,0,n-1);
	    boolean visited[] = new boolean[n+1]; 
	    
        // Create a queue for BFS 
        LinkedList<Integer> queue = new LinkedList<Integer>(); 
  
        // Mark the current node as visited and enqueue it 
        visited[1]=true; 
        queue.add(1); 
        int k=n-1;
        while (queue.size() != 0) 
        { 
            // Dequeue a vertex from queue and print it 
            int s = queue.poll(); 
            ans[s]=c[k];k--;
            // Get all adjacent vertices of the dequeued vertex s 
            // If a adjacent has not been visited, then mark it 
            // visited and enqueue it 
            for(int i=0;i<g[s].size();i++)
            {
            	if(!visited[g[s].get(i)])
            	{
            		visited[g[s].get(i)]=true;
            		queue.add(g[s].get(i));
            	}
            }
        }
        for(int i=1;i<=n;i++)	System.out.print(ans[i]+" ");
	}
}


Compiler output:
Main.java:93: error: method dfs in class Main cannot be applied to given types;
	            	 dfs(gr,arr.get(i));
	            	 ^
  required: ArrayList<Integer>[],int,int[],HashMap<Integer,HashMap<Integer,Integer>>
  found:    ArrayList<Integer>[],Integer
  reason: actual and formal argument lists differ in length
Note: Main.java uses unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 error