La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024

12 problems from La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 (contest 105999), difficulty -. 3/12 solutions verified against sample I/O.

12 items

La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024

Special | 12 problems | 3/12 verified | Difficulty - | 11m 37s

# Problem Rating Tags Accepted Time ✓
A Ace Race 39s ✓
B Big Mod 50s ✓
C Coin Master 32s
D Damage Calculator 31s
E Ekimae 27s
F Fans Only 23s
G Gemini Intrusion 29s
H Harvesting Hack 26s
I Inseparable 47s
J Josephus Went Wrong 5m 23s
K Koala Harris VS Donald Trunk 28s
L Look left? Look right? 42s ✓
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999J - Josephus Went Wrong

Codeforces 105999J: Josephus Went Wrong
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999L - Look left? Look right?

A brute-force strategy is to try every possible center $p$. For each $p$, compute how many flips are needed so that everything left of $p$ becomes $R$ and everything right becomes $L$.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999K - Koala Harris VS Donald Trunk

I’m missing the actual problem statement for Codeforces 105999K - Koala Harris VS Donald Trunk (your prompt has empty “Problem Statement / Input / Output” sections).
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999I - Inseparable

I can’t reliably reconstruct Codeforces 105999I “Inseparable” from the ID alone, and without the actual statement any editorial would be guesswork and likely wrong. Please paste the full problem statement (or even a screenshot / partial text).
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999G - Gemini Intrusion

I can’t reliably write an editorial for “Codeforces 105999G - Gemini Intrusion” without the actual problem statement.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999H - Harvesting Hack

Sure - send me the Codeforces problem statement (or a link/name), and I’ll write a detailed competitive programming editorial. I’ll structure it like a typical CF editorial: 1. Problem restatement / intuition 2. Key observations 3. Derivation of the algorithm 4.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999F - Fans Only

I can’t reliably write a correct editorial for “Codeforces 105999F - Fans Only” because I don’t have the problem statement, and I shouldn’t guess the rules of the problem.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999E - Ekimae

I can write the full editorial in that format, but I’m missing the actual problem details. The identifier “Codeforces 105999E - Ekimae” does not map to a publicly available Codeforces problem statement I can verify, so I would have to invent the rules, constraints, and…
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999D - Damage Calculator

I can’t write a correct editorial for this yet because the actual problem statement (and therefore the mechanics of “damage” calculation) is missing.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999B - Big Mod

We are given multiple queries, each describing a base number, an exponent that can be extremely large (so large that it cannot fit into standard integer types), and a modulus.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999A - Ace Race

The problem models a race on an infinite number line. Alice starts at position a. The prize appears at one of two possible positions, x or y, and Bob must choose a different integer starting position before knowing which one occurs.
codeforces competitive-programming Jun 25, 2026
Practice › Codeforces Solutions › La Salle-Pui Ching Programming Challenge 培正喇沙編程挑戰賽 2024 ›

CF 105999C - Coin Master

I don’t have the actual problem statement for Codeforces 105999C - Coin Master, so I can’t safely reconstruct the intended solution or write a correct editorial yet.
codeforces competitive-programming Jun 25, 2026