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Given the root of a binary tree, the level of its root is 1, the level of its children is 2, and so on. Return the smallest level X …
You have some sticks with positive integer lengths. You can connect any two sticks of lengths X and Y into one stick by paying a cost of X + …
There is a special keyboard with all keys in a single row. Given a string keyboard of length 26 indicating the layout of the keyboard (indexed from 0 to …
Given a string s and a string t, check if s is subsequence of t. You may assume that there is only lower case English letters in both s …
On a broken calculator that has a number showing on its display, we can perform two operations: Double: Multiply the number on the display by 2, or; Decrement: Subtract …