Patterns
simulation

5 problems

​

#

Title

Acceptance

Difficulty

1

Problem Challenge 2: Comparing Strings containing Backspaces (medium)
stack
string
two pointers
+1 more

16.8%

Med.

2

Problem Challenge 2: Rotate a LinkedList (medium)
linked list
recursion
simulation

22.9%

Med.

3

Problem Challenge 2: Minimum Height Trees (hard)
graph
breadth-first search
simulation

29.1%

hard

4

Valid Parentheses (easy)
stack
string
simulation
+1 more

38.0%

easy

5

Valid Sudoku (medium)
matrix
hash set
hash map
+2 more

35.8%

Med.