[……]

[……]

# 1015 Reversible Primes (PTA)

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[……]

# 1065 A+B and C (64bit) (PTA)

Given three integers AB and C in [−2​63​​,2​63​​], you are supposed to tell whether A+B>C.

[……]

# 1028 List Sorting (PTA)

Excel can sort records according to any column. Now you are supposed to imitate this function.

### Input Specification:

Each input file contains one[……]

# 1031 Hello World for U (PTA)

Given any string of N (≥5) characters, you are asked to form the characters into the shape of U. For example, helloworld can[……]

# 1009 Product of Polynomials (PTA)

This time, you are supposed to find A×B where A and B are two polynomials.

### Input Specification:

Each input file co[……]