leetcode6 Reverse Words in a String 单词取反

　　Reverse Words in a String  单词取反

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Question:

Given an input string s, reverse the string word by word.

For example, given s = "the sky is blue", return "blue is sky the".

void reverseWords(string &s) {

vector <string>des;

if(s.empty())

return;

int len = s.size();

for(int i = 0; i < len; i++){

if(s[i] == ' ')

continue;

string word;

while(i < len && s[i] != ' '){

word += s[i];

i++;

}

des.push_back(word);

}

reverse(des.begin(), des.end());

if(des.empty())

s = "";

else {

s.clear();

int j ;

for(j = 0; j < des.size() -1; j++){

s += des[j];

s += ' ';

}

s += des[j];

}

}