Problem:
Given an input string, reverse the string word by word.
For example,
Given s = "the sky is blue",
return "blue is sky the".
解法一：全局翻转 局部翻转
核心代码
void reverseWords(string &str) {
if(str.size()==0) return;
auto beg = str.begin();
auto end = str.end();
reverse(beg,end);
for(auto space = beg; space != end; )
{
space = std::find(beg,end,‘ ‘);
reverse(beg,space);
beg = space + 1;
}
}
别人家的代码
解法二：类似栈的思想 从后往前再翻转 每翻转一个则追加到结果字符串中
void reverseWords(string &s)
{
string rs;
for (int i = s.length()-1; i >= 0; )
{
while (i >= 0 && s[i] == ‘ ‘) i--;
if (i < 0) break;
if (!rs.empty()) rs.push_back(‘ ‘);
string t;
while (i >= 0 && s[i] != ‘ ‘) t.push_back(s[i--]);
reverse(t.begin(), t.end());
rs.append(t);
}
s = rs;
}
LeetCode:Reverse words in a String
原文：http://www.cnblogs.com/xiaoying1245970347/p/4555667.html