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All Permutations of a String with distinct characters

Bulb Switcher

Circus tower sorting

Count the number of 2s between 0 and n

Determine whether two lines would intersect on a Cartesian plane

Find a line to cut two squares in half

Find a line which passes the most number of points

Find if there is a path between two vertices in a directed graph

Find largest 1M numbers in 1B numbers

Find maximum of two numbers without using comparison operators or if-else