inclusive. Call an apartment boring, if its number consists of the same digit. Examples of boring apartments are 11, 2, 777, 9999 and so on. Our character is a troublemaker, and he calls the intercoms of all boring apartments, till someone answers the call, in the following order: • First he calls all apartments consisting of digit 1, in increasing order ( 1, 11, 111, 1111). • Next he calls all apartments consisting of digit 2, in increasing order ( 2, 22, 222, 2222) And so on. The resident of the boring apartment x answers the call, and our character stops calling anyone further. Our character wants to know how many digits he pressed in total and your task is to help him to count the total number of keypresses.

inclusive. Call an apartment boring, if its number consists of the same digit. Examples of boring apartments are 11, 2, 777, 9999 and so on. Our character is a troublemaker, and he calls the intercoms of all boring apartments, till someone answers the call, in the following order: • First he calls all apartments consisting of digit 1, in increasing order ( 1, 11, 111, 1111). • Next he calls all apartments consisting of digit 2, in increasing order ( 2, 22, 222, 2222) And so on. The resident of the boring apartment x answers the call, and our character stops calling anyone further. Our character wants to know how many digits he pressed in total and your task is to help him to count the total number of keypresses.

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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