Glean

Implement calculator that evaluates string expressions.

Requirements:

function calculate(expression: string): number

Supported Operations:
- Addition (+)
- Subtraction (-)
- Multiplication (*)
- Division (/)

Constraints:
- Only integers in expression
- No parentheses
- Handle operator precedence
- Handle whitespace

Example:
Input: "3 + 2 * 2"
Output: 7

Implementation:
1. Parse expression
2. Handle operator precedence
3. Evaluate sub-expressions
4. Return final result

Design database system with basic CRUD operations.

Core Operations:

interface Database<K, V> {
  // Required Operations
  insert(key: K, value: V): void
  remove(key: K): boolean
  retrieve(key: K): V | null
  
  // Optional Operations
  listKeys(): K[]
  update(key: K, value: V): boolean
}

Requirements:
1. Data Storage
- Efficient key-value storage
- Handle collisions
- Memory management

2. Operation Handling
- Fast lookups
- Safe deletions
- Atomic updates

3. Error Cases
- Key not found
- Duplicate keys
- Invalid operations

Find maximum minimum sweetness after dividing chocolate bar.

function maxMinSweetness(
  sweetness: number[],
  k: number
): number

Examples:
1. Input: sweetness = [1,2,3,4,5,6,7,8,9], k = 5
   Output: 6
   Splits: [1,2,3], [4,5], [6], [7], [8], [9]

2. Input: sweetness = [5,6,7,8,9,1,2,3,4], k = 8
   Output: 1
   Explanation: Only one way to split into 9 pieces

3. Input: sweetness = [1,2,2,1,2,2,1,2,2], k = 2
   Output: 5
   Splits: [1,2,2], [1,2,2], [1,2,2]

Requirements:
- k cuts create k+1 pieces
- Each piece has consecutive chunks
- Return max possible minimum sweetness
- Optimize for large inputs

Return balanced string with minimum deletions.

function minDeletionsToBalance(s: string): string

Requirements:
- Remove minimum characters
- Maintain proper ordering
- Match all parentheses

Example:
Input: "())"
Output: "()"

Input: "((("
Output: "()"

Rules:
1. Every '(' needs matching ')'
2. Proper nesting required
3. Minimize deletions

Approach:
1. Track opening/closing counts
2. Identify unmatched pairs
3. Remove minimum necessary
4. Maintain balance property