A matrix is Toeplitz if every diagonal from top-left to bottom-right has the same element. Now given an M x N matrix, return True if and only if the m ...

Given a List of words, return the words that can be typed using letters of alphabet on only one row’s of American keyboard like the image below. Exam ...

On an 8 x 8 chessboard, there is one white rook. There also may be empty squares, white bishops, and black pawns. These are given as characters ‘R’, ...

You are given an array A of strings. Two strings S and T are special-equivalent if after any number of moves, S == T. A move consists of choosing two ...

We are to write the letters of a given string S, from left to right into lines. Each line has maximum width 100 units, and if writing a letter would c ...

Given a string S and a character C, return an array of integers representing the shortest distance from the character C in the string. ExampleInput: S ...

Given a matrix A, return the transpose of A. The transpose of a matrix is the matrix flipped over it’s main diagonal, switching the row and column ind ...

Given a non-empty, singly linked list with head node head, return a middle node of linked list. If there are two middle nodes, return the second middl ...

Given a n-ary tree, find its maximum depth. The maximum depth is the number of nodes along the longest path from the root node down to the farthest le ...

On a N * N grid, we place some 1 * 1 * 1 cubes that are axis-aligned with the x, y, and z axes. Each value v = grid[i][j] represents a tower of v cube ...