I have a huge text file. I want to extract the first 532541 lines of it and store them in another file. Selecting the text with the mouse and executing ctrl c is obviously not a feasible Solution.<
Tag: preamble
Ruby – Rails Model: Validates_Unique Ness_OF Will not delete the endless space before a unique check? Isn’t the front guide?
Suppose I implement validates_uniqueness_of on the username. If the name’maddy’ already exists, then it will accept the value’maddy’ as the unique value instead of’maddy’. It should remove both sid
144. Pre-sequence traversal of the binary tree
Given a binary tree, return its previous traversal.
Example:
Input: [1,null,2,3]
1
\
2
/
3 Output: [1,2,3]
Advanced: The recursive algorithm is very simple, can you do it through