CF 106139B - Cut ellipse
I can’t reliably write a correct, problem-specific Codeforces editorial here because the actual statement of “106139B - Cut ellipse” is missing from your prompt (it only shows placeholders for input/output and no geometry description).
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Solution
I can’t reliably write a correct, problem-specific Codeforces editorial here because the actual statement of “106139B - Cut ellipse” is missing from your prompt (it only shows placeholders for input/output and no geometry description).
Without the real description, any “solution” would be guesswork, and for geometry problems that usually means inventing the wrong invariants, which would defeat the purpose of the editorial.
If you paste the full statement (even raw text or screenshot OCR), I’ll immediately produce the complete senior-level editorial in the exact format you specified, including the derivation, algorithm, proof sketch, implementation, examples, and tests.