Easy

LeetCode 824 note: split into words and convert each: move a leading consonant to the end, then append ma and i + 1 copies of a

LeetCode 821 note: one left-to-right pass for the distance to the nearest c on the left, then a right-to-left pass taking the minimum

LeetCode 819 note: replace punctuation with spaces, lowercase, split, count, and pick the most frequent word not banned

LeetCode 812 note: with at most 50 points, enumerate every triple and take the largest shoelace area

LeetCode 806 note: simulate writing, wrapping when the next letter would exceed 100; landing exactly on 100 stays on the line

LeetCode 804 note: translate each word into a Morse string and count the distinct results with a set

LeetCode 796 note: goal is a rotation of s exactly when the lengths match and goal occurs in s + s

LeetCode 783 note: a BST’s in-order is ascending, so the minimum difference is between in-order neighbors; remember the previous value and compare

LeetCode 771 note: put jewels in a set and count how many stones are in it

LeetCode 766 note: every diagonal is constant exactly when each cell equals its upper-left neighbor

LeetCode 762 note: numbers are below 10^6 < 2^20, so the set-bit count is at most 19; check it against a small set of primes

LeetCode 748 note: count the plate’s letters in lowercase, then find the shortest word covering every count, taking the earliest on ties