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Given an array A of integers, we must modify the array in the following way: we choose an i and repl...

Given an array A of strings made only from lowercase letters, return a list of all characters that s...

On an 8 x 8 chessboard, there is one white rook. There also may be empty squares, white bishops, and...

In a town, there are N people labelled from 1 to N. There is a rumor that one of these people is sec...

In a binary tree, the root node is at depth 0, and children of each depth k node are at depth k+1. T...