https://leetcode.com/problems/diameter-of-binary-tree/description/

Max distance between any nodes in binary tree.

https://leetcode.com/problems/find-bottom-left-tree-value/description/

Leftmost node value of the last level of the Binary Tree.

https://leetcode.com/problems/even-odd-tree/description/

Binary tree levels are odd increasing and even decreasing.

still not to late to celebrate

https://leetcode.com/problems/maximum-odd-binary-number/description/

Max odd number string rearrangement.

https://leetcode.com/problems/squares-of-a-sorted-array/description/

Sorted squares.

https://leetcode.com/problems/remove-nth-node-from-end-of-list/description/

Remove `n`th node from the tail of linked list. #medium

https://leetcode.com/problems/bag-of-tokens/description/

Max score converting power to token[i] and token[i] to score. #medium

https://leetcode.com/problems/minimum-length-of-string-after-deleting-similar-ends/description/

Min length after trimming matching prefix-suffix several times. #medium

https://leetcode.com/problems/linked-list-cycle/description/

Detect cycle #easy

https://leetcode.com/problems/middle-of-the-linked-list/description/

Middle of the Linked List #easy

https://leetcode.com/problems/count-elements-with-maximum-frequency/description/

Count of max-freq nums #easy

https://leetcode.com/problems/minimum-common-value/description/

First common number in two sorted arrays #easy

https://leetcode.com/problems/intersection-of-two-arrays/description/

Intersection of two nums arrays #easy

https://leetcode.com/problems/custom-sort-string/description/

Construct string from s using order #medium

https://leetcode.com/problems/remove-zero-sum-consecutive-nodes-from-linked-list/description/

Remove consequent 0-sum items from a LinkedList #medium

https://leetcode.com/problems/find-the-pivot-integer/description/

Pivot of 1..n where sum[1..p] == sum[p..n]. #easy

https://leetcode.com/problems/binary-subarrays-with-sum/description/

Count goal-sum subarrays in a 0-1 array #medium

https://leetcode.com/problems/product-of-array-except-self/description/

Array of suffix-prefix products #medium

https://leetcode.com/problems/contiguous-array/description/

Max length of subarray sum(0) == sum(1) #medium

https://leetcode.com/problems/insert-interval/description/

Insert interval into a sorted intervals array #medium