2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta

11 problems from 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta (contest 104427), difficulty -. 11/11 solutions verified against sample I/O.

11 items

2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta

Special | 11 problems | 11/11 verified | Difficulty - | 10m 58s

# Problem Rating Tags Accepted Time ✓
A Reversing 51s ✓
B Lawyers 50s ✓
C One, Two, Three 50s ✓
D Lonely King 1m 12s ✓
E Treasure Box 1m 4s ✓
F Beautiful Sequence 49s ✓
G Make Everything White 46s ✓
H Optimal Quadratic Function 55s ✓
I Visiting Friend 1m 12s ✓
J Cooperation Game 1m 14s ✓
K Connect the Dots 1m 15s ✓
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427K - Connect the Dots

We are given several test cases. In each test case, a sequence of points lies on a horizontal line, ordered from left to right. Each point has a color.
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427J - Cooperation Game

We are given a line of students, each student labeled by a class number. The process repeatedly removes two students of the same class, and each removal contributes the distance between their current positions in the line right before removal.
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Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427I - Visiting Friend

We are given a connected undirected simple graph representing a village, where intersections are nodes and roads are edges. For each query, two distinct nodes are fixed, one is the starting house A and the other is the destination house B.
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427H - Optimal Quadratic Function

We are given several independent test cases. In each test case, we observe a set of points on a plane, where each point has a fixed x-coordinate and an observed y-coordinate.
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427G - Make Everything White

We are given an $N times M$ board where each cell is either black or white. The task is to assign to every cell exactly one of three operations.
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427D - Lonely King

We are given a rooted tree where every vertex except the root has exactly one parent, so all edges naturally point away from vertex 1.
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427E - Treasure Box

We are given a string laid out on a number line, where each position contains a single uppercase letter. Turning this string into a palindrome requires changing some characters so that position i matches position N−i+1 for all i.
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CF 104427F - Beautiful Sequence

We are given an array of integers, and we are allowed to freely permute its elements. After choosing an ordering, we assign a “beauty score” to the resulting sequence by counting how many positions are locally good in a weak sense: an index contributes if its value is not…
codeforces competitive-programming Jun 30, 2026
Practice › Codeforces Solutions › 2022-2023 Winter Petrozavodsk Camp, Day 2: GP of ainta ›

CF 104427A - Reversing

We are given a grid of size $N times M$ where each cell is either black or white. The grid we see is not necessarily the original configuration. Instead, the grid may have been transformed by a special operation applied multiple times.
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CF 104427B - Lawyers

We are given a directed relationship between lawyers. Each relationship says that one lawyer trusts another, and this trust has a very specific operational meaning: if lawyer B trusts lawyer A, then A provides a defense for B.
codeforces competitive-programming Jun 30, 2026
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CF 104427C - One, Two, Three

We are given a long sequence made only of the values 1, 2, and 3. From this sequence, we want to extract as many disjoint triples of indices as possible, where each triple uses three different positions and respects the order of indices.
codeforces competitive-programming Jun 30, 2026