Greedy String / Binary Search Problem

Question

## Problem

A greedy string-construction or a binary-search-on-answer problem (e.g., smallest feasible value satisfying a monotonic predicate).

## Example
```
binary search the minimum capacity to ship packages within D days
```

## Constraints
- Monotonic feasibility check

## Approach
Identify the monotonic predicate; binary search the boundary. Explain the check function.