Always analyze the computational complexity of algorithms and choose efficient implementations to avoid performance bottlenecks and security vulnerabilities. Pay special attention to avoiding O(N²) algorithms that can create DoS risks, eliminate unnecessary computational overhead, and select appropriate data structures.
Key practices:
Example of problematic O(N²) code:
// Avoid: O(N²) complexity with DoS risk
for _, v := range bval {
if !slices.Contains(aval, v) {
return false
}
}
// Prefer: O(N) complexity using map lookup
aMap := make(map[string]bool, len(aval))
for _, v := range aval {
aMap[v] = true
}
for _, v := range bval {
if !aMap[v] {
return false
}
}
Consider the security implications of algorithmic complexity, especially in user-facing APIs where input size may be controlled by attackers. When dealing with large datasets or user-controlled input, always prefer linear or logarithmic algorithms over quadratic ones.
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