Spiral Matrix IV.java

class Solution {
    public int[][] spiralMatrix(int m, int n, ListNode head) {
        int[][] ans=new int[m][n];
        for(int[] arr:ans){
            Arrays.fill(arr,-1);
        }
        
        int rowBegin=0;
        int rowEnd=m-1;
        int columnBegin=0;
        int columnEnd=n-1;
        ListNode cur=head;
        
      
        while(rowBegin<=rowEnd && columnBegin<=columnEnd && cur!=null){
            
            for(int i=columnBegin;i<=columnEnd && cur!=null;i++){
                if(cur!=null){
                    ans[rowBegin][i]=cur.val;
                }
               
                    cur=cur.next;
                
                
            }
            rowBegin++;
            for(int i=rowBegin;i<=rowEnd && cur!=null;i++){
               if(cur!=null){
                ans[i][columnEnd]=cur.val;
               }
                
                    cur=cur.next;
                

            }
            columnEnd--;
            if(rowBegin<=rowEnd){
                for(int i=columnEnd;i>=columnBegin && cur!=null;i--){
                if(cur!=null){
                ans[rowEnd][i]=cur.val;
                }
                 
                    cur=cur.next;
                

            }
           
            }
             rowEnd--;
            if(columnBegin<=columnEnd){
                for(int i=rowEnd;i>=rowBegin && cur!=null;i--){
                  if(cur!=null){
                ans[i][columnBegin]=cur.val;
                  }
                 
                    cur=cur.next;
                

            }
            
            }
            columnBegin++;
           
        }
        return ans;
        
    }
}