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authorWilliam Carroll <wpcarro@gmail.com>2020-01-15T14·25+0000
committerWilliam Carroll <wpcarro@gmail.com>2020-01-15T14·25+0000
commitd4d8397e5ffe6734ed5861e48ce475848956a3fe (patch)
tree7f0f8563750a2084ad9a4b9908cbb5316fe6bf10 /data_structures_and_algorithms/array-traversals.py
parentb4ee283b23b8a85c75339e07b0adf43d1c3ca770 (diff)
Add InterviewCake.com examples
Adds some of the code I generated while studying for a role transfer at Google
using the fantastic resource, InterviewCake.com. This work predates the
mono-repo.

I should think of ways to DRY up this code and the code in
crack_the_coding_interview, but I'm afraid I'm creating unnecessary work for
myself that way.
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1 files changed, 87 insertions, 0 deletions
diff --git a/data_structures_and_algorithms/array-traversals.py b/data_structures_and_algorithms/array-traversals.py
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+# This is practice for various types of list traversals that turn up.
+
+xs = range(10)
+n = len(xs)
+
+print('---')
+# pythonic left-to-right traversal
+result = ''
+for x in xs:
+    result += str(x)
+print(result)
+
+print('---')
+# left-to-right traversal
+result = ''
+for i in range(n):
+    result += str(xs[i])
+print(result)
+
+print('---')
+# right-to-left traversal
+result = ''
+for i in range(n):
+    result += str(xs[n - 1 - i])
+print(result)
+
+print('---')
+# 2x left-to-right traversal
+result = ''
+for i in range(2 * n):
+    result += str(xs[i % n])
+print(result)
+
+print('---')
+# 2x right-to-left traversal
+result = ''
+for i in range(2 * n):
+    result += str(xs[(n - 1 - i) % n])
+print(result)
+
+################################################################################
+# Table traversals
+################################################################################
+
+table = [[row * 10 + i for i in range(10)] for row in range(3)]
+row_ct = len(table)
+col_ct = len(table[0])
+
+print('---')
+# 3x10 table traversal
+result = ''
+for row in table:
+    r = ''
+    for col in row:
+        r += '{:3d}'.format(col)
+    result += r + '\n'
+print(result[0:-1])
+
+print('---')
+# 3x10 table traversal
+result = ''
+for row in range(row_ct):
+    r = ''
+    for col in range(col_ct):
+        r += '{:3d}'.format(table[row][col])
+    result += r + '\n'
+print(result[0:-1])
+
+print('---')
+# 3x10 table traversal (reverse)
+result = ''
+for row in range(row_ct):
+    r = ''
+    for col in range(col_ct):
+        r += '{:3d}'.format(table[row_ct - 1 - row][col_ct - 1 - col])
+    result += r + '\n'
+print(result)
+
+print('---')
+# 3x10 column-row traversal
+result = ''
+for col in range(col_ct):
+    r = ''
+    for row in range(row_ct):
+        r += '{:3d}'.format(table[row][col])
+    result += r + '\n'
+print(result)