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★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★★ Count the number of segments in a string, where a segment is defined to be a contiguous sequence of non-space characters. Please note that the string does not contain any non-printable characters. Example: Input: "Hello, my name is John" Output: 5 统计字符串中的单词个数，这里的单词指的是连续的不是空格的字符。 请注意，你可以假定字符串里不包括任何不可打印的字符。 示例: 输入: "Hello, my name is John" 输出: 5 8ms 1 class Solution { 2 func countSegments(_ s: String) -> Int { 3 if s == nil || s.count == 0 {return 0} 4 var word:Int = 0 5 var count:Int = 0 6 //按索引遍历 7 for i in s.indices 8 { 9 if s[i] == " " 10 { 11 if word > 0 12 { 13 count += 1 14 word = 0 15 } 16 } 17 else 18 { 19 word += 1 20 } 21 } 22 if word > 0 23 { 24 count += 1 25 } 26 return count 27 } 28 } 8ms 1 class Solution { 2 func countSegments(_ s: String) -> Int { 3 var count = 0 4 var segmentInProgress = false 5 for char in s { 6 if char != " " && !segmentInProgress { 7 count += 1 8 segmentInProgress = true 9 } else if char == " " { 10 segmentInProgress = false 11 } 12 } 13 14 return count 15 } 16 } 12ms 1 class Solution { 2 func countSegments(_ s: String) -> Int { 3 return s.split(separator: " ").count 4 } 5 } 16ms 1 class Solution { 2 func countSegments(_ s: String) -> Int { 3 return s.characters.split(separator: " ").count 4 } 5 }
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