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434. Number of Segments in a String

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 ' '.

Solutions

Solution 1

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class Solution:
    def countSegments(self, s: str) -> int:
        return len(s.split())

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class Solution {
    public int countSegments(String s) {
        int ans = 0;
        for (String t : s.split(" ")) {
            if (!"".equals(t)) {
                ++ans;
            }
        }
        return ans;
    }
}

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class Solution {
public:
    int countSegments(string s) {
        int ans = 0;
        istringstream ss(s);
        while (ss >> s) ++ans;
        return ans;
    }
};

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func countSegments(s string) int {
    ans := 0
    for _, t := range strings.Split(s, " ") {
        if len(t) > 0 {
            ans++
        }
    }
    return ans
}

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class Solution {
    /**
     * @param String $s
     * @return Integer
     */
    function countSegments($s) {
        $arr = explode(' ', $s);
        $cnt = 0;
        for ($i = 0; $i < count($arr); $i++) {
            if (strlen($arr[$i]) != 0) {
                $cnt++;
            }
        }
        return $cnt;
    }
}

Solution 2

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class Solution:
    def countSegments(self, s: str) -> int:
        ans = 0
        for i, c in enumerate(s):
            if c != ' ' and (i == 0 or s[i - 1] == ' '):
                ans += 1
        return ans

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class Solution {
    public int countSegments(String s) {
        int ans = 0;
        for (int i = 0; i < s.length(); ++i) {
            if (s.charAt(i) != ' ' && (i == 0 || s.charAt(i - 1) == ' ')) {
                ++ans;
            }
        }
        return ans;
    }
}

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

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func countSegments(s string) int {
    ans := 0
    for i, c := range s {
        if c != ' ' && (i == 0 || s[i-1] == ' ') {
            ans++
        }
    }
    return ans
}

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