Deploy Configs Across Namespaces

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Your question is Deploy Configs Across Namespaces. Start with the requirements on the right.

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Problem

Given a configuration payload represented as a JSON string and a list of Kubernetes namespace names, write a function that returns an ordered deployment plan. Each config object contains name, version, and content. For every namespace, include one deployment action per unique (name, version) pair, keeping only the last occurrence from the input JSON while preserving the final effective order.

Constraints

1 <= len(namespaces) <= 10^3
0 <= number of config objects <= 10^4
Each config object contains string fields name, version, and content
Namespace names are non-empty strings
Invalid JSON or malformed config objects should raise ValueError

Function Signature

def build_deployment_plan(namespaces, config_json):

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