Euler problems/111 to 120
Problem 111
Search for 10-digit primes containing the maximum number of repeated digits.
Solution:
problem_111 = undefined
Problem 112
Investigating the density of "bouncy" numbers.
Solution:
problem_112 = undefined
Problem 113
How many numbers below a googol (10100) are not "bouncy"?
Solution:
import Array
mkArray b f = listArray b $ map f (range b)
digits = 100
inc = mkArray ((1, 0), (digits, 9)) ninc
dec = mkArray ((1, 0), (digits, 9)) ndec
ninc (1, _) = 1
ninc (l, d) = sum [inc ! (l-1, i) | i <- [d..9]]
ndec (1, _) = 1
ndec (l, d) = sum [dec ! (l-1, i) | i <- [0..d]]
problem_113 = sum [inc ! i | i <- range ((digits, 0), (digits, 9))]
+ sum [dec ! i | i <- range ((1, 1), (digits, 9))]
- digits*9 -- numbers like 11111 are counted in both inc and dec
- 1 -- 0 is included in the increasing numbers
Note: inc and dec contain the same data, but it seems clearer to duplicate them.
Problem 114
Investigating the number of ways to fill a row with separated blocks that are at least three units long.
Solution:
problem_114 = undefined
Problem 115
Finding a generalisation for the number of ways to fill a row with separated blocks.
Solution:
problem_115 = undefined
Problem 116
Investigating the number of ways of replacing square tiles with one of three coloured tiles.
Solution:
problem_116 = undefined
Problem 117
Investigating the number of ways of tiling a row using different-sized tiles.
Solution:
problem_117 = undefined
Problem 118
Exploring the number of ways in which sets containing prime elements can be made.
Solution:
problem_118 = undefined
Problem 119
Investigating the numbers which are equal to sum of their digits raised to some power.
Solution:
problem_119 = undefined
Problem 120
Finding the maximum remainder when (a − 1)n + (a + 1)n is divided by a2.
Solution:
problem_120 = undefined