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This question is broken for Swift:
Solution/Solution.swift:46: Fatal error: Unexpectedly found nil while unwrapping an Optional value Current stack trace: 0 libswiftCore.so 0x00007db1d2704ae0 swift_reportError + 50 1 libswiftCore.so 0x00007db1d277d270 _swift_stdlib_reportFatalErrorInFile + 109 2 libswiftCore.so 0x00007db1d2489e70 <unavailable> + 1412720 3 libswiftCore.so 0x00007db1d2489bd5 <unavailable> + 1412053 4 libswiftCore.so 0x00007db1d24898a8 <unavailable> + 1411240 5 libswiftCore.so 0x00007db1d2489390 _assertionFailure(_:_:file:line:flags:) + 341 6 Solution 0x00005596c7d62a75 <unavailable> + 6773 7 libc.so.6 0x00007db1d1fbafc0 __libc_start_main + 243 8 Solution 0x00005596c7d6211e <unavailable> + 4382
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Tree: Height of a Binary Tree
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This question is broken for Swift: