307. Island Perimeter
EasyGrid
The grid has exactly one island of 1s (connected horizontally/vertically). Print its perimeter.
Input format
Line 1: r c Next r lines: c values (0/1)
Output format
The perimeter.
Example 1
Input
4 4 0 1 0 0 1 1 1 0 0 1 0 0 1 1 0 0
Output
16
Example 2
Input
1 1 1
Output
4
Constraints
1 ≤ r, c ≤ 100
Read input from standard input and print the answer to standard output. Your code is judged against 3 test cases, most of them hidden.
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