Choose optimal data structures

Select data structures based on their algorithmic complexity and usage patterns. Consider the tradeoffs between different structures (e.g., Vec vs HashMap) and their impact on performance. Key considerations:

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Select data structures based on their algorithmic complexity and usage patterns. Consider the tradeoffs between different structures (e.g., Vec vs HashMap) and their impact on performance. Key considerations:

  1. Use HashSet/HashMap for O(1) lookups when uniqueness checking is primary concern
  2. Prefer Vec when order matters or when performing sequential operations
  3. Consider memory layout and cache locality for performance-critical code

Example:

// Suboptimal: Using HashMap when order matters
let mut pieces: HashMap<String, f64> = HashMap::new();

// Better: Using Vec with HashSet for uniqueness
let mut pieces: Vec<(String, f64)> = vec![];
let mut inserted: HashSet<String> = HashSet::new();

// Best: Single pass implementation for pattern matching
let mut prev = 0;
let mut splits = Vec::with_capacity(inside.len());
for m in self.find_iter(inside) {
    if prev != m.start() {
        splits.push(((prev, m.start()), false));
    }
    splits.push(((m.start(), m.end()), true));
    prev = m.end();
}

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