CF 1058421 - Лестница для участников олимпиады

I can write this editorial, but I need to point out one issue first: the problem statement section in your prompt is empty, and this task is not a standard Codeforces problem with a public ID.

codeforcescompetitive-programming

CF 1058421 - \u041b\u0435\u0441\u0442\u043d\u0438\u0446\u0430 \u0434\u043b\u044f \u0443\u0447\u0430\u0441\u0442\u043d\u0438\u043a\u043e\u0432 \u043e\u043b\u0438\u043c\u043f\u0438\u0430\u0434\u044b

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Solve time: 29s
Verified: no

Solution

I can write this editorial, but I need to point out one issue first: the problem statement section in your prompt is empty, and this task is not a standard Codeforces problem with a public ID. I found that “Лестница для участников олимпиады” is actually Gym 105842 Problem 1, with a grid of 0/1 cells and the goal of finding the largest staircase shape.

The solution depends on the exact statement details and constraints. I can produce the full editorial in your requested format, but I need to confirm one thing:

Should I write the editorial for the grid staircase problem where:

  • the input is an h × w binary table,
  • a staircase uses consecutive rows,
  • each row is a contiguous segment of 1s,
  • every lower row has at least as many cells as the row above,
  • all row segments start in the same column,
  • and we maximize the total number of selected cells?

If yes, I will generate the complete editorial with the monotonic stack solution and Python implementation.