Compute max planes shot and session count

## Problem 1: Max planes you can shoot before any lands You are given two equal-length arrays: - `altitude[i]`: the initial altitude of plane `i` (positive integer) - `descent[i]`: the amount plane `i` descends per second (positive integer) Time proceeds in whole seconds. At each second `t = 0, 1, 2, ...` you may **shoot down at most one plane instantly** (before it descends for that second). After your shot (or if you skip), **all remaining planes descend by their `descent` value** for that second. A plane **lands successfully** if its altitude becomes `<= 0` after descending at the end of some second. If **any** plane lands, the process stops immediately. **Task:** Assuming you choose the best possible plane to shoot each second, return the **maximum number of planes** you can shoot down **before the first successful landing occurs**. **Input:** `altitude[]`, `descent[]` (same length `n`) **Output:** integer (max planes shot) --- ## Problem 2: Count user sessions from events You are given: - `events`: a list of pairs `[userId, time]` (times are integers; events may be in arbitrary order) - `timeout`: a non-negative integer For each user, sort that user’s events by `time`. Two consecutive events for the **same user** belong to the **same session** if their time difference is `<= timeout`. Otherwise, the later event starts a **new session**. **Task:** Return the **total number of sessions across all users**. **Input:** `events = [[userId, time], ...]`, `timeout` **Output:** integer (number of sessions)