Done is better than perfect

Question Given an m x n 2D binary grid [grid] which represents a map of '1's (land) and '0's (water), return the number of islands. An island is surrounded by water and is formed by connecting adjacent lands horizontally or vertically. You may assume all four edges of the grid are all surrounded by water. m x n 인 2차원 grid가 주어진다. grid의 1은 땅, 0은 물을 의미할 때 island의 개수를 세라. island는 물로 상하좌우가 둘러싸인 땅을 의미..

Question Given an m x n grid of characters board and a string word, return true if word exists in the grid. The word can be constructed from letters of sequentially adjacent cells, where adjacent cells are horizontally or vertically neighboring. The same letter cell may not be used more than once. Follow up: Could you use search pruning to make your solution faster with a larger board? 문자판의 m x ..