NoOfPlatforms.cs

 public int findPlatform(int[] arr, int[] dep,int n)
        {
            //code here
             Array.Sort(arr);
            Array.Sort(dep);
            
            var noOfPlatforms = 0;
            
            var i = 0;
            var j = 0;
            while (i<n){
                if(arr[i]<=dep[j]){
                noOfPlatforms++;
                
                }
               else{
                   j++;
               }
                i++;
            }
            return noOfPlatforms;
        }