Do rounding nearest integer.
Example: -8.8, answer -9
+8.1 answer 8
+8.50 answer 9
give nth decimal place of pi
Add two numbers
Find the hypotenuse
2倍してみよう - ここからスタート！
Divide by 4
Union of two set decreasing order
Find out rooms, peak to peak, average for a square wave.
Convert decimal to hex as shown in test cases
Crate a vector of logarithmically spaced
Find out sum of prime number till given number
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