SmartPhone CodeChef Solution

Hello Programmers In this post, you will know how to solve the Smartphone Codechef Solution. Which is a part of DSA Learning Series.

One more thing to add, don’t directly look for the solutions, first try to solve the problems of Codechef by yourself. If you find any difficulty after trying several times, then you can look for solutions.

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 in Java

/* package codechef; // don't place package name! */
import java.util.*;
import java.lang.*;
import java.io.*;
/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
    public static void main (String[] args) throws java.lang.Exception
    {
        // your code goes here
        Scanner sc = new Scanner(System.in);
        int n = sc.nextInt();
        long arr[] = new long[n];
        for(int i=0 ; i<n ;i++)
        {
              arr[i]=sc.nextInt();
        }
        Arrays.sort(arr);
            for(int i=0 ; i<n ;i++)
        {
              arr[i]=arr[i]*(n-i);
        }
        Arrays.sort(arr);
        System.out.println(arr[n-1]);
    }
}

SmartPhone CodeChef Solution in CPP

#include<bits/stdc++.h>
using namespace std;
int main()
{
   long long int n;
   cin>>n;
   long long int arr[n];
   for(int i=0;i<n;i++)
   {
       cin>>arr[i];
   }
   sort(arr,arr+n);
   long long int x=0;
   for(int i=0;i<n;i++)
   {
        long long int temp=arr[i]*(n-i);
        if(temp>x){
            x=temp;}
   }
   cout<<x;
}

SmartPhone CodeChef Solution in Python

num = int(input())
l1 = list()
gre = 0
count = num
for i in range(num):
    s = int(input())
    l1.append(s)
l1.sort()
for i in l1:
    ans = count * int(i)
    count = count-1
    if(ans >= gre):
        gre = ans
print(gre)

Disclaimer: The above Problem (SmartPhone CodeChef) is generated by CodeChef but the solution is provided by BrokenProgrammers. This tutorial is only for Educational and Learning purpose.

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