leetcode 434. Number of Segments in a String 按照空格分割字符串 + C++的stringstream的一个很好应用示范

谁借莪１个温暖的怀抱￠ 2022-06-04 08:19 182阅读 0赞

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

字符串分割，题意很简单就不说了，就是要注意处理各种极端case

注意直接使用C++的stringstream来处理十分的方便

代码如下：

#include <iostream>
    #include <vector>
    #include <map>
    #include <unordered_map>
    #include <set>
    #include <unordered_set>
    #include <queue>
    #include <stack>
    #include <string>
    #include <climits>
    #include <algorithm>
    #include <sstream>
    #include <functional>
    #include <bitset>
    #include <numeric>
    #include <cmath>
    #include <regex>
    
    using namespace std;
    
    
    class Solution 
    {
    public:
        int countSegments(string s)
        {
            stringstream ss(s);
            string tmp = "";
            int count = 0;
            while (ss >> tmp)
                count++;
            return count;
        }
    
        int countSegmentsByCala(string s)
        {
            if (s.length() <= 0)
                return 0;
    
            int count = 0;
            for (int i = 0; i<s.length(); i++)
            {
                if (s[i] != ' ' && i + 1<s.length() && s[i + 1] == ' ')
                    count++;
            }
            return count + (s[s.length() - 1] != ' ');
        }
    };