Section 1Understand Problem
Section 01
Understand the problem
Restate the problem precisely. Interviewers reward candidates who pause, define the contract, and name the guarantees before coding.
Problem statement
Given an `m × n` grid of `'1'` (land) and `'0'` (water), return the number of islands. An island is a group of adjacent lands connected horizontally or vertically and surrounded by water.
Example
grid = [['1','1','0'],['1','0','0'],['0','0','1']] → 2
Constraints
1 ≤ m, n ≤ 300
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