The map is a grid of '1' (served) and '0' (not served). Cells connect up/down/left/right. Return the number of connected served zones.
Signature
countZones(grid: string[]) → intExample 1
grid = ["11000","11000","00100","00011"]
output = 3
3 zones
Example 2
grid = ["111","010","111"]
output = 1
1 zone
Constraints
1 ≤ rows, cols ≤ 300
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