CSES Problem Set: Sorting and Searching

#	Problem	Time	✓
A	Distinct Numbers	41s	✓
B	Apartments	2m 16s
C	Ferris Wheel	44s	✓
D	Concert Tickets	51s	✓
E	Restaurant Customers	46s	✓
F	Movie Festival	23s
G	Sum of Two Values	45s	✓
H	Maximum Subarray Sum	38s	✓
I	Stick Lengths	2m 27s
J	Missing Coin Sum	38s	✓
K	Collecting Numbers	38s	✓
L	Collecting Numbers II	44s	✓
M	Playlist	24s
N	Towers	24s
O	Traffic Lights	27s
P	Josephus Problem I	2m 14s
Q	Josephus Problem II	45s	✓
R	Nested Ranges Check	2m 22s
S	Nested Ranges Count	1m	✓
T	Room Allocation	25s
U	Factory Machines	43s	✓
V	Tasks and Deadlines	42s	✓
W	Reading Books	2m 27s
X	Sum of Three Values	43s	✓
Y	Sum of Four Values	39s	✓
Z	Nearest Smaller Values	29s

Practice › Codeforces Solutions › CSES Problem Set: Sorting and Searching ›

CF 102961P - Josephus Problem I

The solution does not address the stated problem at all. The exercise asks to prove the law of spread/core duality, $$X^{sim +} = X^{circ sim},$$ which is a statement about TAOCP operators on combinatorial objects.

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CF 102961Z - Nearest Smaller Values

We are given a sequence of numbers, and for every position we want to find a “nearest smaller value” that appears before it.

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CF 102961W - Reading Books

The solution does not address the stated problem at all. The exercise asks to prove the law of spread/core duality, $$X^{sim +} = X^{circ sim},$$ which is a statement about TAOCP operators on combinatorial objects.

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CF 102961Y - Sum of Four Values

We are given a sequence of numbers and a target value, and the task is to determine whether there exist four distinct positions in the sequence such that the values at those positions add up exactly to the target.

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CF 102961X - Sum of Three Values

We are given a sequence of numbers and a target value. The task is to determine whether there exist three distinct elements in the sequence whose sum equals the target, and if so, return their positions in the original array.

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CF 102961V - Tasks and Deadlines

Each task has two properties: how long it takes to finish and a deadline that is used to evaluate how “late” you are when you complete it. You must execute all tasks sequentially starting from time zero, choosing any order you want.

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CF 102961R - Nested Ranges Check

The solution does not address the stated problem at all. The exercise asks to prove the law of spread/core duality, $$X^{sim +} = X^{circ sim},$$ which is a statement about TAOCP operators on combinatorial objects.

Practice › Codeforces Solutions › CSES Problem Set: Sorting and Searching ›

CF 102961U - Factory Machines

We are given a collection of independent factory machines, each of which can repeatedly produce identical items. The i-th machine produces one item every fixed amount of time, so if it runs for a total time T, it contributes roughly T divided by its processing time, rounded…

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CF 102961T - Room Allocation

You’re right to stop me here before I start inventing details. The problem statement is missing from the prompt you provided, so an editorial cannot be written correctly yet.

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CF 102961S - Nested Ranges Count

We are given a collection of intervals on the number line, each interval representing a segment with a left endpoint and a right endpoint. For every interval, we need to understand its position relative to all other intervals in terms of nesting.

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CF 102961Q - Josephus Problem II

We are simulating a circular elimination process over a line of people labeled from 1 to n. A step size k is fixed.

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CF 102961I - Stick Lengths

The solution does not address the stated problem at all. The exercise asks to prove the law of spread/core duality, $$X^{sim +} = X^{circ sim},$$ which is a statement about TAOCP operators on combinatorial objects.

Practice › Codeforces Solutions › CSES Problem Set: Sorting and Searching ›

CF 102961O - Traffic Lights

I can’t write a correct Codeforces editorial without the actual problem statement. “Traffic Lights” (Codeforces 102961O) isn’t provided here, and there are multiple well-known variants of problems with that name (online insertion of lights on a street segment, queries…

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CF 102961N - Towers

I can write the full Codeforces-style editorial, but I’m missing the actual problem statement for Codeforces 102961N - Towers.

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CF 102961L - Collecting Numbers II

We are given a permutation of the integers from 1 to $n$, arranged in some order. Alongside this, we receive a sequence of operations, where each operation swaps two positions in the permutation.

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CF 102961M - Playlist

I don’t have the actual statement of Codeforces 102961M - Playlist in your prompt. Without the problem details (input format, constraints, and required output), I can’t produce a correct editorial or solution.

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CF 102961K - Collecting Numbers

We are given a sequence of integers representing a permutation-like arrangement of distinct numbers. The task is to determine how many “rounds” it takes to process all numbers in increasing order, where each round consists of scanning the sequence from left to right and…

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CF 102961J - Missing Coin Sum

We are given a collection of positive integers that can be interpreted as coin values. Each value can be used at most once, and by selecting some subset of these coins we can form different total sums.

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CF 102961H - Maximum Subarray Sum

We are given a sequence of integers, and we need to find the maximum possible sum of a contiguous segment of that sequence. A contiguous segment means we pick a starting position and an ending position, and take all elements in between without skipping any.

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CF 102961G - Sum of Two Values

We are given a list of integers and a target value. The task is to determine whether there exist two distinct elements in the list whose sum equals the target. If such a pair exists, we must output their positions (typically 1-indexed).

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CF 102961B - Apartments

The solution does not address the stated problem at all. The exercise asks to prove the law of spread/core duality, $$X^{sim +} = X^{circ sim},$$ which is a statement about TAOCP operators on combinatorial objects.

Practice › Codeforces Solutions › CSES Problem Set: Sorting and Searching ›

CF 102961F - Movie Festival

I don’t have the actual statement for Codeforces 102961F - Movie Festival, so I can’t reliably reconstruct the correct model, constraints, or solution. For an editorial, guessing would just produce a misleading write-up.

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CF 102961D - Concert Tickets

The task revolves around a marketplace of fixed-priced concert tickets and a sequence of buyers arriving one after another. Each ticket has a price, and each buyer has a maximum amount they are willing to pay.

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CF 102961E - Restaurant Customers

We are given a timeline of customer visits to a restaurant, where each customer appears at some moment and leaves at some later moment. Each customer contributes a continuous time interval during which they are present inside the restaurant.

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CF 102961C - Ferris Wheel

We are given a line of people, each with a weight, and a Ferris wheel where each cabin can hold at most two people as long as their combined weight does not exceed a fixed limit.

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CF 102961A - Distinct Numbers

The task is about taking a sequence of integers and determining how many different values appear in it. You are given a list of numbers, and the output is a single integer representing the size of the set formed by these numbers, meaning duplicates are ignored and only unique…