Write a C function that reverses a null-terminated string in place.
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This C code crashes. Find the bug:
char *dup = malloc(strlen(s));
strcpy(dup, s);
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Write a SQL query that returns the three highest-paid employees per department from a table employees(id, name, dept, salary).
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Complete this Python function:
def binary_search(arr, target):
    lo, hi = 0, len(arr) - 1
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Write a C function that computes the dot product of two float arrays of length n.
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Explain the difference between a mutex and a semaphore in two sentences.
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Write a C function int popcount(uint32_t v) without using compiler builtins.
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If a train travels 60 km in 45 minutes, what is its average speed in km/h?
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Alice is taller than Bob. Bob is taller than Carol. Carol is taller than Dave. Who is the second tallest?
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If today is Wednesday, what day of the week will it be in 100 days?
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Sort these numbers in ascending order and explain your method: 34, 7, 23, 32, 5, 62.
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If 5 machines take 5 minutes to make 5 widgets, how long do 100 machines take to make 100 widgets?
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A rectangle has perimeter 20 and area 24. What are its side lengths?
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Which weighs more: a kilogram of feathers or a kilogram of steel? Explain in one sentence.
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What are three practical tips for improving sleep quality?
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Draft a short, polite email declining a meeting invitation because of a schedule conflict.
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Explain the rules of rock-paper-scissors to someone who has never played.
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Translate "Good morning, how are you today?" into French and Spanish.
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Write a two-sentence bedtime story about a robot who learns to paint.
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Explain inflation in economics using a simple everyday example.