This question runs in a pre-configured Salesforce environment - no personal connection required.
Count countries in a specified region using REST Countries v3.1. Return null for null input. Endpoint: https://restcountries.com/v3.1/region/{region}
Examples:
Input: region = 'Europe'
Output: 50
Explanation: There are 50 countries in the Europe region
Input: region = 'Asia'
Output: 48
Explanation: There are 48 countries in the Asia region
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