Python C++使用字串find迴圈速解Leetcode 2490 Circular Sentence

Python C++使用字串find迴圈速解Leetcode 2490  Circular Sentence

C++ & Python都有字串的find，用法都類似

split=s.find(' ', split+1)能找到s從index=split+1開始出現' '的第一個的index

[Python解請進, C++ 一行解]

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C++ & Python both have string find, and their usage is similar.

split=s.find(' ', split+1) can find the first index where ' ' appears in s starting from index=split+1

[codes on Leetcode]https://leetcode.com/problems/circular-sentence/solutions/5995203/use-string-view-find-beats-100/

[Leetcode Playlist]https://www.youtube.com/watch?v=B1GQlUN08lk&list=PLYRlUBnWnd5IdDHk2BjqXwesydU17z_xk

class Solution:
    def isCircularSentence(self, s: str) -> bool:
        if s[0]!=s[-1]: 
            return False
        split=-1
        while True:
            split=s.find(' ', split+1)
            if split==-1: 
                break
            if s[split-1]!=s[split+1]: 
                return False
        return True

C++ 1-liner

class Solution {
public:
    bool isCircularSentence(string& s) {
        return s[0]==s.back() && all_of(s.begin(), s.end(), [&, i=0](auto _) mutable{
            return !i++|| s[i]!=' ' || s[i-1]==s[i+1];
        });
    }
};