simple
234. Palindrome linked list (exclusive OR method, space complexity O(1), time complexity O(n))
476. Number's complement (bitwise exclusive OR)
844. Comparison of strings with backspace (stack )
925. Long key input (string comparison)
1365. How many numbers are less than the current number (sort preprocessing, linear solution)
medium
143. Rearrange the linked list (converted into a linear table)
763. Divide the letter interval (preprocess the position of the same character after the suffix, O(n) greedy traversal solution)
845. The longest mountain range in the array (dynamic programming preprocessing, find the longest Maximum value of rising and longest falling sum)
1024. Video stitching (interval preprocessing, greedy)