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Computer Introduction To Data Science Difficulty: Medium

In which data structure is a "red-black tree" used, and what is its primary benefit? What will be the output of the following C code? #include<stdio.h> enum colour { blue, red, yellow }; main() { enum colour c; c=yellow; printf("%d",c); } What requires less resources? In C#, what does the "using" directive do? What is the purpose of the ORDER BY statement in Apache Pig?