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simple loops if-else floating-point arithmetic mathematics geometry modulo practical hash classical strings puzzle arrays sorting data-structures ascii binary finance games dynamic-programming random cryptography graphs popular-algorithm long-numbers physics implementation simulation auxiliary brainfuck music machine-learning challenge combinatorics external-file data-compression numeral-system regexp web-related space interactive hackercup assembly astronomy web-development scheme artificial-intelligence arena c-1 c-0 sql turing special pretty-print basic interviews logic digital-signal-processing unlabeled lua python