Clarifications (See all..)
[K. Train Lights] can the value of R be negative or can it be exactly 2^64.
Read and analyse the statement carefully.
[F. Counting Phone Numbers] Can there be both - and () present in valid network operator?
Read the problem statement carefully.
[F. Counting Phone Numbers] What is lexicograhical order?
The lexicographic or lexicographical order (also known as lexical order, dictionary order, alphabetical order or lexicographic(al) product) is a generalization of the way the alphabetical order of words is based on the alphabetical order of their component..
[I. Snake Game] Can a fruit appear in a cell where the snake currently exists?