Codeforces Beta Round 84 (Div. 2 Only)

Solutions for Codeforces Beta Round 84 (Div. 2 Only) (contest 110). 2/2 problems verified against sample I/O. Difficulty range: 800-1100.

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Codeforces Beta Round 84 (Div. 2 Only)

Type: Div. 2 | Problems: 2 | Verified: 2/2 | Rating range: 800-1100 | Time: 5m 34s

Problem	Name	Rating	Tags	Solve Time	Verified
A	Nearly Lucky Number	800	implementation	2m 36s	✓
B	Lucky String	1100	constructive-algorithms, strings	2m 58s	✓

Practice › Codeforces Solutions › Codeforces Beta Round 84 (Div. 2 Only) ›

CF 110A - Nearly Lucky Number

We are given a positive integer and need to decide whether it is a nearly lucky number. A number is considered nearly lucky if the count of its lucky digits-digits equal to 4 or 7-is itself a lucky number. A lucky number contains only 4s and 7s in its decimal representation.

Practice › Codeforces Solutions › Codeforces Beta Round 84 (Div. 2 Only) ›

CF 110B - Lucky String

We need to build a lowercase string of length n that satisfies a special condition on repeated letters. For every character, we look at all positions where it appears.