viral_advert.java

//Viral advertising
/*Example
.
n=5
Day Shared Liked Cumulative
1      5     2       2
2      6     3       5
3      9     4       9
4     12     6      15
5     18     9      24
The progression is shown above. The cumulative number of likes on the 5 day is 24.*/

class Result {

    /*
     * Complete the 'viralAdvertising' function below.
     *
     * The function is expected to return an INTEGER.
     * The function accepts INTEGER n as parameter.
     */

    public static int viralAdvertising(int n) {
    // Write your code here
        int shared=5;
        int liked=0;
        int cumlikes=0;
        for(int i=1;i<=n;i++){
            liked=shared/2;
            cumlikes+=liked;
            shared=liked*3;
        }
        return cumlikes;

    }

}

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

        int n = Integer.parseInt(bufferedReader.readLine().trim());

        int result = Result.viralAdvertising(n);

        bufferedWriter.write(String.valueOf(result));
        bufferedWriter.newLine();

        bufferedReader.close();
        bufferedWriter.close();
    }
}