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PAT1035. Password (20) To prepare for PAT, the judge sometimes has to generate random passwords for the users. The problem is that there are always some confusing passwords since it is hard to distingu

Programming Ability Test1031. Hello World for U (20)Given any string of N (>=5) characters, you are asked to form the characters into the shape of U. For example, “helloworld” can be printed as:h  d e

PAT (Advanced Level) Practise 11201120. Friend Numbers (20)Two integers are called “friend numbers” if they share the same sum of their digits, and the sum is their “friend ID”. For example, 123 and 51

PAT (Advanced Level) Practise 10311015. Reversible Primes (20)A reversible prime in any number system is a prime whose “reverse” in that number system is also a prime. For example in the decimal system

PAT (Advanced Level) Practise 11201036. Boys vs Girls (25)This time you are asked to tell the difference between the lowest grade of all the male students and the highest grade of all the female studen

PAT (Advanced Level) Practise 10921092. To Buy or Not to Buy (20)Eva would like to make a string of beads with her favorite colors so she went to a small shop to buy some beads. There were many colorfu

PAT (Advanced Level) Practise 10101010. Radix (25)Given a pair of positive integers, for example, 6 and 110, can this equation 6 = 110 be true? The answer is “yes”, if 6 is a decimal number and 110 is

PAT (Advanced Level) Practise 10271027. Colors in Mars (20)People in Mars represent the colors in their computers in a similar way as the Earth people. That is, a color is represented by a 6-digit numb