Find the Number of Islands
Prereq: BFS on Graph
Given a 2-dimensional matrix of values with 0
and 1
, count the number of islands
of 1
. An island consists of all value 1
cells and is surrounded by either an edge or all 0
cells. A cell can only be adjacent to each other horizontally or vertically, not diagonally.
Title
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1 >>> a = [1, 2, 3] 2 >>> a[-1] 3 3