Zaglol Contest - FCDS level 2 contest 2026

11 problems from Zaglol Contest - FCDS level 2 contest 2026 (contest 106351), difficulty -. 7/11 solutions verified against sample I/O.

11 items

Zaglol Contest - FCDS level 2 contest 2026

Special | 11 problems | 7/11 verified | Difficulty - | 7m 34s

#	Problem	Time	✓
A	Zaglol welcoming	25s	✓
B	El GCD haywady Ashraf fe 7eta tanya	1m 57s
C	Fady: Ya baraaaa el mat3am feeeen	51s	✓
D	Ashraf's Town	20s
E	Baby Baraa playing with LEGO	33s	✓
F	El mask mesh hena	22s
G	Zeyad's Symmetric Functions	25s
H	Fady mesh fady	28s	✓
I	Omar and Data Structures 1	51s	✓
J	Zaghloul and the spies	30s	✓
K	Wala matgeesh bra7tek howa enty hatzeleniiiii	52s	✓

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351K - Wala matgeesh bra7tek howa enty hatzeleniiiii

We have an array of positive integers. We need to count index pairs (i, j) where i < j and the two chosen values satisfy two number theory conditions at the same time. Their greatest common divisor must be at least x, and their least common multiple must not exceed y.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351I - Omar and Data Structures 1

We are working with a fixed 3×3 board of 9 cells, where each cell may either already contain a digit or be empty. The digits involved are 1 through 9, each used exactly once in a final completed configuration.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351J - Zaghloul and the spies

We have a line of people, where each person carries a number a[i]. A person is classified as a spy when the XOR of every positive divisor of their number is a multiple of k.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351B - El GCD haywady Ashraf fe 7eta tanya

Sure. Please provide the Codeforces problem statement (or a link/title), and I’ll write a detailed competitive programming editorial covering: - Problem restatement - Key observations - Derivation of the algorithm - Proof of correctness - Complexity analysis - Implementation…

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351H - Fady mesh fady

We are given a collection of positive integers A. We must assign another positive integer Bi to every element so that every product Ai Bi is exactly the same value. Among all possible assignments, we need the smallest possible sum of all chosen Bi.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351G - Zeyad's Symmetric Functions

I can’t write a correct editorial for this yet because the actual statement of Codeforces 106351G - Zeyad’s Symmetric Functions is missing from the accessible material, and the pages I can see are clearly polluted with unrelated problems from the same gym archive.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351E - Baby Baraa playing with LEGO

We have n LEGO piece types, numbered from 1 to n, and an array where each position tells us the type of piece placed there. For every query [l, r], we look only at the pieces between those two positions and need to print any type that does not appear in that segment.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351F - El mask mesh hena

I can write this editorial in exactly the style you want, but I’m missing the only thing that makes it possible: the actual problem content.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351C - Fady: Ya baraaaa el mat3am feeeen

We are given an odd number of elements, first a multiset of values $H$, and another list $W$. We are allowed to pick exactly one value from $W$ and insert it into $H$, making the total number of elements even.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351D - Ashraf's Town

I can write the editorial, but the requested format requires a complete worked solution, code, and test suite. The response length needed for all sections would exceed a single message limit. I will provide it in parts: 1. Problem Understanding + Approaches 2.

Practice › Codeforces Solutions › Zaglol Contest - FCDS level 2 contest 2026 ›

CF 106351A - Zaglol welcoming

The task is a small output-only style exercise disguised as a normal input problem. A string is given, but its content has no effect on the required result. The program only needs to welcome the contest by printing the fixed text FCDS.