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Reverse Words in a String
Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue
",
return "blue is sky the
".
click to show clarification.
Clarification:
- What constitutes a word?
A sequence of non-space characters constitutes a word. - Could the input string contain leading or trailing spaces?
Yes. However, your reversed string should not contain leading or trailing spaces. - How about multiple spaces between two words?
Reduce them to a single space in the reversed string.
class Solution { public: void reverseWords(string &s) { int length=s.length(); if(length==0) return; string result; int index=0; while(true) { while(s[index]==‘ ‘ && index<length) index++; if(index==length) break; string word; while(s[index]!=‘ ‘ && index<length) word=word+s[index++]; if(result=="") result=word; else result=word+" "+result; } s=result; } };
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