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Reverse Words in a String
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".
c++版：
class Solution { public: void reverseWords(string &s){ string ss; int i = s.length()-1; while(i>=0){ while(i>=0&&s[i] ==‘ ‘){ i--; } if(i<0) break; if(ss.length()!=0){ ss.push_back(‘ ‘); } string temp; for(;i>=0&&s[i]!=‘ ‘;i--){ temp.push_back(s[i]); } reverse(temp.begin(),temp.end()); ss.append(temp); } s = ss; }};java版：
public class Solution { public String reverseWords(String s) { StringBuilder result_str = new StringBuilder(); if(s.length()==0)//s=""; { return new String(""); } for (int i = s.length() - 1; i >= 0;) { while (i >= 0 && s.charAt(i) == ‘ ‘) { i--; } if (i < 0) { break; } StringBuilder str = new StringBuilder(); while (i >= 0 && s.charAt(i) != ‘ ‘) { str.append(s.charAt(i--)); } str.reverse(); str = str.append(" "); result_str.append(str); } if(result_str.length()==0)//s=" "; { return new String(""); } return new String(result_str.deleteCharAt(result_str.length()-1)); } }
Reverse Words in a String
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