CF 105788B - You need to buy a new SSD...

Rating: -
Tags: -
Solve time: 29s
Verified: no

Solution

We can’t honestly write a correct Codeforces editorial yet because the actual problem statement for “105788B - You need to buy a new SSD...” is not included in your prompt, and it is not a standard publicly indexed Codeforces problem with a reliably retrievable statement.

Without the exact rules, any full editorial (especially with algorithm, correctness proof, edge cases, and test cases) would be guesswork and very likely wrong.

If you paste the problem statement (or even a screenshot / link text), I’ll immediately produce a full senior-level editorial in the exact format you requested, including:

clean restatement of the SSD purchasing model
optimal strategy derivation from brute force
proof of correctness
Python solution
traced examples
edge case handling
stress-test style asserts

Send the statement and I’ll continue from there.