You are given a binary matrix of size m x n, where 1 represents land and 0 represents water. An island is a group of 1’s connected horizontally or vertically. Return the area of the largest island. If there are no islands, return 0.
You are given an m x n grid representing an image, where each element in the grid corresponds to a pixel value. Additionally, you’re provided with three integers: sr (starting row), sc (starting column), and color. Your task is to perform a flood fill operation on the image starting at the pixel located at (sr, sc).
Given a Tic-Tac-Toe board represented as a 3x3 string array, return true if and only if this board could have been reached during a valid Tic-Tac-Toe game. In a valid game, players alternate placing ‘X’ and ‘O’ characters into empty spaces. ‘X’ always goes first, and no player can move after the game has ended.
In a city grid, buildings are represented by an n x n matrix where each element corresponds to the height of a building at a specific location. You can increase the height of any building in the city grid, but the increased height should not alter the skyline of the city when viewed from any of the four cardinal directions (north, south, east, and west). Your task is to calculate the maximum sum of the heights that can be added to the buildings without changing the skyline.
You are given two square binary matrices img1 and img2, both of size n x n. Each matrix consists of 0s and 1s. You are allowed to slide img1 over img2 in any direction (up, down, left, or right) without rotating the matrix. Your task is to find the maximum number of overlapping positions where both img1 and img2 have a 1 in the same position after performing a translation.
Given a grid of integers, the task is to find how many 3x3 magic square subgrids are present in the given grid. A 3x3 magic square is a grid that contains distinct numbers from 1 to 9, such that each row, each column, and both diagonals have the same sum. The input grid can contain numbers ranging from 0 to 15, but only numbers between 1 and 9 are valid for forming a magic square.
