题目链接

string reverse(string s1)
{string s2;string::reverse_iterator rit = s1.rbegin();while (rit != s1.rend()){s2 += *rit;rit++;}return s2;
}
class Solution {
public:string reverseWords(string s) {string s1;
int i = 0;
int j = 0;
int length = s.length();
for (i = 0; i < length; )//因为不知道具体单词长度，这里不做++处理
{while (s[j] != ' ')//找到下一个空格{j++;if (j >= length){break;}}int k = j - i;//所需反转的单词长度string tmp = s.substr(i, k);tmp = reverse(tmp);s1 += tmp;int m = s.find(' ');s1 += ' ';i += k+1;j = i+1;}
//最后得出的s1末尾会多一个空格，把它截断
s1 = s1.substr(0, s1.length() - 1);return s1;}
};