leetcode

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434. Number of Segments in a String

题目

You are given a string s, return the number of segments in the string.

A segment is defined to be a contiguous sequence of non-space characters.

Example 1:

Input: s = "Hello, my name is John"
Output: 5
Explanation: The five segments are ["Hello,", "my", "name", "is", "John"]

Example 2:

Input: s = "Hello"
Output: 1

Example 3:

Input: s = "love live! mu'sic forever"
Output: 4

Example 4:

Input: s = ""
Output: 0

Constraints

• 0 <= s.length <= 300
• s consists of lower-case and upper-case English letters, digits or one of the following characters "!@#$%^&*()_+-=',.:".
• The only space character in s is ' '.

题目大意

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。

解题思路

• 以空格为分割计算元素个数

代码

package leetcode

func countSegments(s string) int {
	segments := false
	cnt := 0
	for _, v := range s {
		if v == ' ' && segments {
			segments = false
			cnt += 1
		} else if v != ' ' {
			segments = true
		}
	}
	if segments {
		cnt++
	}
	return cnt
}