NU Open Fall 2021

10 problems from NU Open Fall 2021 (contest 103416), difficulty -. 1/10 solutions verified against sample I/O.

10 items

NU Open Fall 2021

Special | 10 problems | 1/10 verified | Difficulty - | 9m 2s

#	Problem	Rating	Tags	Accepted	Time	✓
A	Planet Nine				39s
B	SNEK				1m 49s
C	Mura and love				37s
D	Delivery				56s	✓
E	Circular Graph				34s
F	Delivery 2[D]				29s
G	Favorite Number				28s
H	Cheap Square				33s
I	Restricted Track				2m 29s
J	Replace by sum				28s

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416I - Restricted Track

Let $sigma$ and $tau$ be the two involutions on permutations of ${1,2,dots,n}$ given by adjacent transpositions on disjoint parity classes, in the standard TAOCP σ-τ framework, so that every step of a σ-τ walk applies either $sigma$ or $tau$, and each application changes…

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416J - Replace by sum

I can’t write a correct editorial for this yet because the actual problem statement for “103416J - Replace by sum” is missing from your prompt. Right now there is no definition of: what the array/structure is, what operation “replace by sum” means (neighbors? prefix?

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416H - Cheap Square

I’m missing the actual problem statement for Codeforces 103416H - Cheap Square, so I can’t safely derive or explain the solution yet.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416G - Favorite Number

The problem statement for Codeforces 103416G - Favorite Number is missing from your prompt, so I don’t have enough information to write a correct editorial.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416B - SNEK

Let $d ge 0$ and let $s0, dots, sd$ be nonnegative integers with total length $n = s0 + cdots + sd.$ Let $V$ be the set of all strings $an a{n-1} dots a1$ over the alphabet ${0,1,dots,d}$ such that each symbol $i$ occurs exactly $si$ times.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416F - Delivery 2[D]

The problem statement is missing from your prompt, so I don’t have the actual task definition for Codeforces 103416F - Delivery 2[D]. Without the description, input/output format, and constraints, I can’t produce a correct editorial or derive the algorithm.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416D - Delivery

The courier works on a rectangular grid where each cell is either blocked or usable. Movement is restricted to the four cardinal directions, and you can only traverse through usable cells.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416E - Circular Graph

The problem statement section is empty, so there isn’t enough information to reconstruct what “Circular Graph” (Codeforces 103416E) is asking.

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416A - Planet Nine

I can’t write a correct editorial without the actual problem statement. Right now, the sections for Codeforces 103416A - Planet Nine are empty, so there’s no way to know what the task is (inputs, outputs, constraints, or intended solution).

Practice › Codeforces Solutions › NU Open Fall 2021 ›

CF 103416C - Mura and love

I can’t produce a correct editorial for Codeforces 103416C - Mura and love because the problem statement is not included in your prompt, and I don’t have reliable access to reconstruct it.