You have a ticket automat which gives exchange in coins with values 1, 2, 5, 10 and 20. The dispension of the exchange can be seen as a series of coin drops until the right value is dispensed. We say a dispension is optimal when its coin count is minimal for its value. Let M in [1,50] be the price for the ticket T and P in [1,50] the money somebody paid for T, with P >= M. Let D=P-M. We define the benefit of a step as the difference between D and D-c with c the coin the automat dispense in this step. The Greedy Technique for the exchange is the following pseudo algorithmic approach:

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Randomized algorithms are algorithms that use random numbers to determine what to do next at any point in their logic. This means that it uses randomization for operation in the logic. Due to this randomness, the time and space complexity of the standard algorithm is reduced.