Codeforces Round 260 (Div. 2)

2 problems from Codeforces Round 260 (Div. 2) (contest 456), difficulty 1100-1200. 2/2 solutions verified against sample I/O.

2 items

Codeforces Round 260 (Div. 2)

Div. 2 | 2 problems | 2/2 verified | Difficulty 1100-1200 | 2m 34s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Laptops	1100	sortings	56,754	1m 28s	✓
B	Fedya and Maths	1200	math, number-theory	18,564	1m 6s	✓

Practice › Codeforces Solutions › Codeforces Round 260 (Div. 2) ›

CF 456A - Laptops

We are given a collection of laptops. Each laptop has a price and a quality value. Prices are all distinct, and qualities are all distinct. Dima believes that a more expensive laptop must always have better quality. Alex claims that this is not necessarily true.

Practice › Codeforces Solutions › Codeforces Round 260 (Div. 2) ›

CF 456B - Fedya and Maths

The task asks for the remainder when the sum of the first four multiples of a very large number n is divided by 5. In other words, you need to compute (1n + 2n + 3n + 4n) mod 5.