Similar to num of islands, label each area with 1,2,3,…
Remove parenthesis to make a string to be valid
Lunch and ask about one demon of my project
A matrix has person ‘*’, wall ‘#’, exit ‘e’, and empty ‘.’, get the time needed for all persons to exit the maze
Serialize and deserialize binary tree
Talk about reactjs and js, how to implement a table using javascript, the table contains 1000 rows and 20 cols, and want to change data format of all cells from percentage to absolute value , for example, -4% to -20