SmartPhone CodeChef Solution

Today we will be solving Smartphone Codechef which is the part of DSA Learning Series.

SmartPhone CodeChef Solution

Problem

Zonal Computing Olympiad 2014, 30 Nov 2013

You are developing a smartphone app. You have a list of potential customers for your app. Each customer has a budget and will buy the app at your declared price if and only if the price is less than or equal to the customer’s budget.

You want to fix a price so that the revenue you earn from the app is maximized. Find this maximum possible revenue.

For instance, suppose you have 4 potential customers and their budgets are 30, 20, 53 and 14. In this case, the maximum revenue you can get is 60 .

Input

Line 1 : N, the total number of potential customers.

Lines 2 to N+1: Each line has the budget of a potential customer.

Output

The output consists of a single integer, the maximum possible revenue you can earn from selling your app.

Sample Input 1

4
30
20
53
14

Sample Output 1

60

Sample Input 2

5
40
3
65
33
21

Sample Output 2

99

Explanation

Test data

Each customers’ budget is between 1 and 108, inclusive.

Subtask 1 (30 marks) : 1 ≤ N ≤ 5000.

Subtask 2 (70 marks) : 1 ≤ N ≤ 5×105.

Live evaluation data

There are 15 test inputs on the server during the exam. The grouping into subtasks is as follows.

• Subtask 1: Test inputs 0,…,5

• Subtask 2: Test inputs 6,…,14

Note

The answer might not fit in a variable of type int. We recommend that you use variables of type long long to read the input and compute the answer. If you use printf and scanf, you can use %lld for long long.

SmartPhone CodeChef Solution

SmartPhone CodeChef Solution