Given n people, everyone must have pictures taken with everyone, each photo includes only two persons, please count the total number of pictures.
Given two strings, find the maximum overlap
Roll the Dice!
Project Euler: Problem 8, Find largest product in a large string of numbers
Find the sum of the elements in the "second" diagonal
speed vs size
An asteroid and a spacecraft
Size of this cup?
chance in percent for minimum K heads when a good coin is tossed N times?
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