434. Number of Segments in a String

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


输出字符串一共有几段


C++（3ms）：

class Solution {
public:
    int countSegments(string s) {
        int res = 0 ;
        s.push_back(' ') ;
        for (int i = 1 ; i < s.length() ; i++){
            if (s[i] == ' ' && s[i-1] != ' ')
                res++ ;
        }
        return res ;
       
    }
};