Testing Round 15 (Unrated)

Solutions for Testing Round 15 (Unrated) (contest 1177). 2/2 problems verified against sample I/O. Difficulty range: 1000-1800.

2 items

Testing Round 15 (Unrated)

Type: Special | Problems: 2 | Verified: 2/2 | Rating range: 1000-1800 | Time: 6m 35s

Problem	Name	Rating	Tags	Solve Time	Verified
A	Digits Sequence (Easy Edition)	1000	implementation	5m 3s	✓
B	Digits Sequence (Hard Edition)	1800	binary-search, divide-and-conquer, implementation	1m 32s	✓

Practice › Codeforces Solutions › Testing Round 15 (Unrated) ›

CF 1177A - Digits Sequence (Easy Edition)

We are given a single positive integer $k$, and we imagine writing all positive integers in order, starting from 1, directly next to each other without spaces or separators. This produces one continuous digit stream like 12345678910111213... and so on.

Practice › Codeforces Solutions › Testing Round 15 (Unrated) ›

CF 1177B - Digits Sequence (Hard Edition)

We are asked to consider the infinite string formed by writing all positive integers consecutively without any separators: "1234567891011121314…". Given a position $k$, we must determine which digit occupies that place.