LeetCode 434. Number of Segments in a String

[quinnwencn]

Description

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

Constraints:

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

[quinnwencn]

Analysis

Solution written in Cpp

class Solution {
public:
    int countSegments(string s) {
        stringstream ss {s};
        int ret = 0;
        string tmp;
        while (ss >> tmp) {
            ret++;
        }

        return ret;
    }
};

Solution written in Rust

impl Solution {
    pub fn count_segments(s: String) -> i32 {
        if s.len() == 0 {
            return 0;
        }
        let vs: Vec<&str> = s.split_whitespace().collect();
        vs.len() as i32
    }
}

[quinnwencn]

In Rust, split only splits with a single delimiter. split_whitespace can detect multiple delimiters.