Vim(2)

LeetCode Day 34: P206. Reverse Linked List (Easy)

题目

反转一个单向链表。

Input: 1->2->3->4->5->NULL
Output: 5->4->3->2->1->NULL

我的思路

依次修改箭头方向。

答案

public class E_206_ReverseLinkedList {
    public ListNode reverseList(ListNode head) {
        ListNode current = head;
        ListNode pre = null;
        while(current != null) {
            current = current.next;
            head.next = pre;
            pre = head;
            head = current;
        }
        return pre;
    }
}

Vim CRUD

Insert

a/i/o, A/I/O

Delete in normal mode

• x: delete one charater
• dw: delete a word, default is “daw”, also delete all spaces after the word.
• diw: delete inner word
• dd: delete a line
• dt): delete to “)”
• d$: delete to end
• d0: delete to start
• 2dd: delete two lines
• 4x: delete four characters
• u: undo
• Ctrl + r: undo undo

Change

r(replace), c(change), s(substitute)

• r: just replace a character
• R: Replace multiple characters.
• s: substitute and go to the insert mode.
• S: delete the whole line and go to insert mode.
• 4s: delete the next four characters and go to insert mode.
• cw: change the word. caw: change a word
• C: delete the whole line and insert
• ct*: change to something.

Search

• / or ? search forward or backwards
• n/N jump to next or last match
• * or # search for the same word as current word.
• :set hls highlight words (not working on my computer)
• :set incsearch increment search.

Search and Replace

• substitute

:[range]s[ubstitute]/{pattern}/{string}/[flags]

10, 20 means 10-20 lines; % means all

• g global
• c confirm
• n number: search for match number

For example: :% s/abc/def/g Substitute all “abc” to “def”.

:1,3 s/abc/def/g Substitute all “abc” to “def” between line 1 and line 3 include.

:1,5 s/abc//n Counting number of a certain word. Count how many “abc” from line 1 to line 5. (not working in the vscode vim, but it works in the linux vi)

• Substitute with Regex

:% s/\<abc\>/def/g Only substitute the word “abc” without anything around.