Tough Sample Problem for Java

Hey guys;

I've run into a sample problem that I'm really interested in solving, but to no avail. Me and my friends were trying to solve it for a few days but still can't seem to get it. I was wondering if someone in the community could help.

The question:

" Zero That Out

Problem Description

Your boss has asked you to add up a sequence of positive numbers to determine how much money your company made last year.

Unfortunately, your boss reads out numbers incorrectly from time to time.

Fortunately, your boss realizes when an incorrect number is read and says “zero”, meaning “ignore the current last number.”

Unfortunately, your boss can make repeated mistakes, and says “zero” for each mistake.

For example, your boss may say “One, three, five, four, zero, zero, seven, zero, zero, six”, which means the total is 7 as explained in the following chart:

Boss statement(s) Current numbers Explanation “One, three, five, four” “zero, zero“ “seven” “zero, zero” “six” 1, 3, 5, 4 1, 3 1, 3, 7 1 1, 6 Record the first four numbers. Ignore the last two numbers. Record the number 7 at the end of our list. Ignore the last two numbers. We have read all numbers, and the total is 7. At any point, your boss will have said at least as many positive numbers as “zero” statements. If all positive numbers have been ignored, the sum is zero.

Write a program that reads the sequence of boss statements and computes the correct sum.

Input Specification

The first line of input contains the integer K (1 ≤ K ≤ 100 000) which is the number of integers (including “zero”) your boss will say. On each of the next K lines, there will either be one integer between 1 and 100 (inclusive), or the integer 0.

Output Specification

The output is one line, containing the integer which is the correct sum of the integers read, taking the “zero” statements into consideration. You can assume that the output will be an integer in the range 0 and 1 000 000 (inclusive).

Sample Input 1 4 3 0 4 0

Output for Sample Input 1

0

Sample Input 2

10

1

3

5

4

0

0

7

0

0

6

Output for Sample Input 2

7 "

Thanks so much guys!

Nick