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leetcode - Reverse Words in a String

2014-03-08 19:18  张汉生  阅读(162)  评论(0)    收藏  举报

 

 1 class Solution {
 2 public:
 3     void reverseWords(string &);
 4 };
 5 void Solution::reverseWords(string &s){
 6     int len = s.length();
 7     int i =0 ;
 8     stack<string> st;
 9     while (i<len){
10         while (i<len && s[i]==' ')
11             i++;
12         string tmpStr="";
13         while (i<len && s[i] != ' '){
14             tmpStr += s[i];
15             i++;
16         }
17         if (tmpStr.length()>0)
18             st.push(tmpStr);
19     }
20     s = "";
21     while (!st.empty()){
22         if (s.length()>0)
23             s += " ";
24         s += st.top();
25         st.pop();
26     }
27 }