Calculate y/x using Patch
Reported by candidates from Two Sigma's online assessment. Pattern, common pitfall, and the honest play if you blank under the timer.
Two Sigma hit you with a division problem in November that looks trivial but isn't. You're computing y divided by x and formatting the result to exactly two decimal places. The trap is thinking this is about math when it's actually about string formatting and edge cases. If you freeze on the OA, StealthCoder reads the problem and gives you the pattern instantly so you don't waste time second-guessing yourself on something this fundamental.
The problem
Given two integers y and x, compute y / x. Assume x is non-zero and return the result formatted to exactly two decimal places. 10 / 2 = 5, formatted to two decimal places as 5.00.
Reported by candidates. Source: FastPrep
Pattern and pitfall
The algorithm is straightforward: divide y by x, then format to two decimal places. The real work is in the formatting. Most languages have built-in functions for this (sprintf, format strings, printf-style methods), but the trick is handling negative results, zero, and ensuring the output is always exactly two decimal places, not rounded weirdly. The pitfall is assuming integer division or forgetting that y and x are integers but the result is a float. StealthCoder bridges the gap if you blank on the syntax for your language's formatter by showing you the exact call you need on the live assessment.
Drill it cold or hedge it with StealthCoder. Either way, don't walk into the OA hoping you remember the trick.
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Calculate y/x using Patch FAQ
Is this really just about formatting, or is there a math trick?+
Just formatting. The math is y divided by x. The challenge is the output format: exactly two decimal places, handled by your language's string formatting function. No edge case tricks beyond handling negatives and zero correctly.
What if y is smaller than x? Will the result be a decimal between 0 and 1?+
Yes. 1/2 becomes 0.50. The formatter handles it. Make sure your language's format function doesn't truncate or round unexpectedly. Test with a few cases before submitting.
Do I need to worry about integer overflow or precision loss?+
Unlikely for this problem. Two Sigma's examples suggest small integers. Convert to float, divide, format. If precision becomes an issue, the problem would hint at it. It doesn't.
How do I format to exactly two decimal places in my language?+
Python: f'{y/x:.2f}' or f'{float(y)/float(x):.2f}'. JavaScript: (y/x).toFixed(2). Java: String.format('%.2f', (double)y/x). Know your language's formatter before the OA.
Will Two Sigma test negative numbers or edge cases like 0.00?+
Likely yes. Test -5/2 (should be -2.50), 0/5 (should be 0.00), and 5/2 (should be 2.50) in your head. Make sure your formatter doesn't add a leading + or drop the negative sign.