19 lines
549 B
Nim
19 lines
549 B
Nim
import strutils
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proc missingPermutation(arr: openArray[string]): string =
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result = ""
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if arr.len == 0: return
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if arr.len == 1: return arr[0][1] & arr[0][0]
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for pos in 0 ..< arr[0].len:
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var s: set[char] = {}
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for permutation in arr:
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let c = permutation[pos]
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if c in s: s.excl c
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else: s.incl c
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for c in s: result.add c
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const given = """ABCD CABD ACDB DACB BCDA ACBD ADCB CDAB DABC BCAD CADB CDBA
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CBAD ABDC ADBC BDCA DCBA BACD BADC BDAC CBDA DBCA DCAB""".splitWhiteSpace()
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echo missingPermutation(given)
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