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naitharvs.iliakhaburdzania

Meta strings - Check if two strings can become same after a swap in one string

Code
Diff
  • func areMetaStrings(_ first: String, _ second: String) -> Bool {
  guard first.count == second.count else { return false }
  let combinations = zip(first, second).filter { $0.0 != $0.1 }
  guard combinations.count == 2 else { return false }
  
  return combinations
      .map { [$0.0, $0.1] }
      .flatMap { $0 }
      .reduce(into: Set()) { $0.insert($1) }
      .count == 2
}
    • func areMetaStrings(_ str1: String, _ str2: String) -> Bool {
    • if str1.count != str1.count {
    • return false
    • }
    • let str1Arr = Array(str1)
    • let str2Arr = Array(str2)
    • var set = Set<Character>()
    • var falseCount = 0
    • for i in 0..<str1.count {
    • if str1Arr[i] != str2Arr[i] {
    • falseCount += !set.insert(str1Arr[i]).inserted ? 1 : 0
    • falseCount += !set.insert(str2Arr[i]).inserted ? 1 : 0
    • }
    • }
    • return falseCount == 2
    • func areMetaStrings(_ first: String, _ second: String) -> Bool {
    • guard first.count == second.count else { return false }
    • let combinations = zip(first, second).filter { $0.0 != $0.1 }
    • guard combinations.count == 2 else { return false }
    • return combinations
    • .map { [$0.0, $0.1] }
    • .flatMap { $0 }
    • .reduce(into: Set()) { $0.insert($1) }
    • .count == 2
    • }