Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
given 3 sides, find area of this triangle
Rotate and display numbered tile
Find out missing number from a vector of 9 elements
Try 1.5.4: Celsius to Fahrenheit
Use of regexp
Check if sorted
give nth decimal place of pi
radius of a spherical planet
Predicting life and death of a memory-less light bulb
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