style: comment

Author: 0x01f7

algorithms/evaluate_reverse_polish_notation.rb

@@ -1,12 +1,12 @@
 # https://leetcode.com/problems/evaluate-reverse-polish-notation/
 #
-# Evaluate the value of an arithmetic expression in Reverse Polish
-# Notation. Valid operators are +, -, *, /. Each operand may be
-# an integer or another expression.
+# Evaluate the value of an arithmetic expression in Reverse Polish Notation.
+# Valid operators are +, -, *, /. Each operand may be an integer or another
+# expression.
 #
 # Some examples:
 #
-#     ["2", "1", "+", "3", "*"] -> ((2 + 1) * 3) -> 9
+#     ["2", "1", "+", "3", "*"]  -> ((2 + 1) * 3)  -> 9
 #     ["4", "13", "5", "/", "+"] -> (4 + (13 / 5)) -> 6
 
 

algorithms/excel_sheet_column_number.rb

@@ -1,7 +1,7 @@
 # https://leetcode.com/problems/excel-sheet-column-number/
 #
-# Given a column title as appear in an Excel sheet, return its
-# corresponding column number.
+# Given a column title as appear in an Excel sheet, return its corresponding
+# column number.
 #
 # For example:
 #
@@ -12,6 +12,11 @@
 #     Z -> 26
 #     AA -> 27
 #     AB -> 28
+#
+# Credits:
+#
+#     Special thanks to @ts for adding this problem and creating all test
+#     cases.
 
 
 # @param {String} s

algorithms/excel_sheet_column_title.rb

@@ -1,7 +1,7 @@
 # https://leetcode.com/problems/excel-sheet-column-title/
 #
-# Given a positive integer, return its corresponding column title
-# as appear in an Excel sheet.
+# Given a positive integer, return its corresponding column title as appear in
+# an Excel sheet.
 #
 # For example:
 #
@@ -12,6 +12,11 @@
 #     Z -> 26
 #     AA -> 27
 #     AB -> 28
+#
+# Credits:
+#
+#     Special thanks to @ifanchu for adding this problem and creating all
+#     test cases.
 
 
 # @param {Integer} n

algorithms/expression_add_operators.rb

@@ -1,8 +1,8 @@
 # https://leetcode.com/problems/expression-add-operators/
 #
-# Given a string that contains only digits 0-9 and a target value, return
-# all possibilities to add binary operators (not unary) +, -, or * between
-# the digits so they evaluate to the target value.
+# Given a string that contains only digits 0-9 and a target value, return all
+# possibilities to add binary operators (not unary) +, -, or * between the
+# digits so they evaluate to the target value.
 #
 # Examples:
 #
@@ -11,6 +11,11 @@
 #     "105", 5 -> ["1*0+5","10-5"]
 #     "00" , 0 -> ["0+0", "0-0", "0*0"]
 #     "3456237490", 9191 -> []
+#
+# Credits:
+#
+#     Special thanks to @davidtan1890 for adding this problem and creating
+#     all test cases.
 
 
 # @param {String} num