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Add brute force solution

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This commit is contained in:
Jessica Kwok 2021-04-26 13:59:02 -07:00
parent 211bb2c23f
commit 79ca68d958
1 changed files with 156 additions and 22 deletions
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178
data_structures/arrays/sudoku.rb
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@ -9,32 +9,166 @@
# @return {Boolean}
#
# Approach 1:
#
# Time Complexity:
# Approach 1: Hash & Brute Force
#
def is_valid_sudoku(board)
rows = []
columns = []
grids = []
# make each row into a hash to track for duplicated values
board.each do |row|
row_hash = Hash.new(0)
row.each do |num|
next if num == "."
row_hash[num] += 1
end
rows << row_hash
end
# check each row hash for duplicated value
rows.each do |row|
row.each do |k, v|
if v > 1
return false
end
end
end
# make each column into a hash to track for duplicated values
(0..8).each do |i|
column_hash = Hash.new(0)
board.each do |row|
next if row[i] == "."
column_hash[row[i]] += 1
columns << column_hash
end
end
# check each column hash for duplicated value
columns.each do |column|
column.each do |k, v|
if v > 1
return false
end
end
end
# make each 3x3 grid into a hash to track for duplicated values
(0..2).each do |i|
grid_hash = Hash.new(0)
board.first(3).each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board[3..5].each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board.each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
end
(3..5).each do |i|
grid_hash = Hash.new(0)
board.first(3).each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board[3..5].each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board.each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
end
(6..8).last(3).each do |i|
grid_hash = Hash.new(0)
board.first(3).each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board[3..5].each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
board.each do |row|
next if row[i] == "."
grid_hash[row[i]] += 1
grids << grid_hash
end
end
# check each grid hash for duplicated value
grids.each do |grid|
grid.each do |k, v|
if v > 1
return false
end
end
end
true
end
board = [["5","3",".",".","7",".",".",".","."]
,["6",".",".","1","9","5",".",".","."]
,[".","9","8",".",".",".",".","6","."]
,["8",".",".",".","6",".",".",".","3"]
,["4",".",".","8",".","3",".",".","1"]
,["7",".",".",".","2",".",".",".","6"]
,[".","6",".",".",".",".","2","8","."]
,[".",".",".","4","1","9",".",".","5"]
,[".",".",".",".","8",".",".","7","9"]]
board = [["5","3",".",".","7",".",".",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
["8",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]]
print(is_valid_sudoku(board))
# => true
board = [["8","3",".",".","7",".",".",".","."]
,["6",".",".","1","9","5",".",".","."]
,[".","9","8",".",".",".",".","6","."]
,["8",".",".",".","6",".",".",".","3"]
,["4",".",".","8",".","3",".",".","1"]
,["7",".",".",".","2",".",".",".","6"]
,[".","6",".",".",".",".","2","8","."]
,[".",".",".","4","1","9",".",".","5"]
,[".",".",".",".","8",".",".","7","9"]]
board = [["8","3",".",".","7",".",".",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
["8",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]]
print(is_valid_sudoku(board))
# => false
# => false
# explanation: duplicated value in column
board = [["8","3",".",".","7",".","3",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
["8",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]]
print(is_valid_sudoku(board))
# => false
# explanation: duplicated value in row
board = [["8","3",".",".","7",".",".",".","."],
["6",".",".","1","9","5",".",".","."],
[".","9","8",".",".",".",".","6","."],
[".",".",".",".","6",".",".",".","3"],
["4",".",".","8",".","3",".",".","1"],
["7",".",".",".","2",".",".",".","6"],
[".","6",".",".",".",".","2","8","."],
[".",".",".","4","1","9",".",".","5"],
[".",".",".",".","8",".",".","7","9"]]
print(is_valid_sudoku(board))
# => false
# explanation: duplicated value in 3x3 grid