J'ai postulé via une autre source. Le processus a pris 1 semaine. J'ai passé un entretien chez BlueOptima (Guadalajara, Jalisco) en sept. 2020
Entretien
The process took a week, I received an email from recruiter via LinkedIn, then we had a quick call where he explained about the company and role. The only person I had interaction with was this recruiter who is very nice and polite.
Problem: You are given a number n.
Find the decimal value of the number formed by the concatenation of the binaryrepresentation of the first n positive integers. Print the answer 10^9 + 7.
Output format: Print the answer modulo 10^9 + 7
Constraint: 1 <= n <= 10^9
Sample input: 3
Sample Output: 27
The binary representation of 1: 1
The binary representation of 2: 10
The binary representation of 3: 11
Concatenated string: 11011 -> Decimal representation is 27.