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Read in a roman numeral n and convert it to a decimal number. (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5 and I = 1)

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04 Roman to decimal

 

Read in a roman numeral n and convert it to a decimal number. (M = 1000, D = 500, C = 100, L = 50, X = 10, V = 5 and I = 1)

 

Example: n = DXII --> 500 + 10 + 1 + 1 = 512 

(tip: work with the length of a word and ElementAt())

 

 

 

Input/Output

input:

DXII

output:

512

 

input:

MDCCXXXIIII

output:

1734

 

 

04 Floyd's triangle

 

Read in a number a lines and print out the triangle of Floyd! https://en.wikipedia.org/wiki/Floyd%27s_triangle Links to an external site.

 

 

 

Input/Output

input:

5

output:

2 3 

4 5 6 

7 8 9 10 

11 12 13 14 15 

 

input:

2

output:

2 3 

 

 

 

 

04 Factorial

 

Read in a nonnegative integer n (if not, print out 'crazy input') and calculate its factorial n!. The factorial formula is given by n! = 1 * 2 * 3 * ... *n

 

Some examples:

0! = 1

1! = 1

2! = 1 * 2 = 2

3! = 1 * 2 * 3 = 6 ...

 

 

 

Input/Output

input:

7

output:

5040

 

input:

1

output:

1

 

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