4qqqq's blog

By 4qqqq, history, 6 months ago,

We apologize for the delay in editorial of the tasks.

A. Hossam and Combinatorics

Idea: _HossamYehia_

Tutorial
Solution(_HossamYehia_)

B. Hossam and Friends

Idea: _HossamYehia_

Tutorial
Solution(_HossamYehia_)

C. Hossam and Trainees

Idea: _HossamYehia_

Tutorial
Solution(_HossamYehia_)

D. Hossam and (sub-)palindromic tree

Idea: 4qqqq

Tutorial
Solution(4qqqq)

E. Hossam and a Letter

Idea: _HossamYehia_

Tutorial
Solution(_HossamYehia_)

F. Hossam and Range Minimum Query

Idea: 4qqqq

Tutorial
Solution(4qqqq, trie)
Solution(Aleks5d, bitset)
• +90

By 4qqqq, 18 months ago,
Solution

B. Divan and a New Project

Solution

C. Divan and bitwise operations

Solution

D1. Divan and Kostomuksha (easy version)

Solution

D2. Divan and Kostomuksha (hard version)

Solution

E. Divan and a Cottage

Solution
• +8

By 4qqqq, history, 18 months ago, translation,

Hello, Codeforces!

On Nov/26/2021 14:15 (Moscow time) Codeforces Round 757 (Div. 2) will start. This round will be rated for participants with a rating less than $2100$.

All the problems were authored and prepared by vaaven and me.

You will be given $5$ problems, one of which has two subtasks. You will have 2 hours to solve them.

We would like to thank everyone helped a lot with round preparation:

Score distribution: $500$ — $750$ — $1500$ — $(1500 + 1000)$ — $2750$.

Good luck everyone!

UPD: Editorial

• +99