plz tell whats wrong in my code

general
1

plz tell me whats wrong in my code

question link-link text

import java.util.Scanner;
class practice
{
public static void main(String[] arg)
{
	Scanner kb=new Scanner(System.in);
	int test=kb.nextInt();
	for(int j=0;j<test;j++)
	{
		int size=kb.nextInt();
		int arr[] =new int [size];
		int cust=kb.nextInt();
		for(int i=0;i<arr.length;i++)
		arr[i]=kb.nextInt();
		int sum=0;
		for(int i=0;i<arr.length;i++)
		sum=sum+arr[i];
		if((sum/cust)<size)
		System.out.println("-1");
		else
		System.out.println(sum/cust);
	}
}

}

2

Heres the bug-

Compilation Successful
Input (stdin)
1
5 5
1 1 1 1 1
Your Output
-1
Expected Output
1

Here, he gave 5 bank notes of 1, and one sweet costs $1. So he can buy one sweet, but your code flags him as inadequate.

The problem is here-

if((sum/cust)<size)

This is not a valid condition to check for adequate customers. To see if a customer is adequate or not, check for presence of a redundant note, meaning if you remove that note from total, is the number of sweet still same? If yes, then the person is redundant. That’s what I feel.

Make changes and get back to me with result :slight_smile:

3

https://www.codechef.com/viewsolution/8618823
This is my AC solution…actually your approach is not correct.
Feel free to ask any query.

4

but how to find which note is to be remove…removing randomly or what!

5

You can find it by removing all notes one by one and checking. Meaning, make a loop, remove one note from sum and see if its redundant or not, then remove next one… until we reach the end. If somewhere you find a note is redundant, mark it and print -1. Else print sum/cust.

1 Like
6

@vijju123
Also it can be done alternatively…I used sort function and then removed first note.
It was easy to check.

1 Like
7

Thanks bro…!

and hatsoff to your explanation

and now i feel like “yeah i have over the right place and free to ask anything…beacuse mentors are there to help”
thanks!

1 Like
8

Ya, this is also correct, because the smallest note is the one to prove redundant. If its not redundant, then all notes larger than it are.

9

Glad we were able to help you dear :).