[LeetCode] 434.Number of Segments in a String

• 题目描述
• 解题思路
• 实验代码

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题目描述

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

解题思路

这道题主要在于如何寻找到所需要的“字段”，该字段必须满足：1.它的最后一个字符之后是空格；或者，2.它的最后一个字符就是该字符串的最后一个字符；且，3.它之中的每个字符都不是空格。想到这几个条件之后就能很轻松解决这道题了。

实验代码

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