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leetcode_151.cpp
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leetcode_151.cpp
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class Solution {
public:
string reverseWords(string s) {
int left = 0;
int right = s.size() - 1;
while(left <= right && s[left] == ' ') left++;
while(right >= 0 && s[right] == ' ') right --;
deque<string> d;
string word;
while(left <= right){
char c = s[left];
if (word.size() && c == ' '){
d.push_front(word);
word = "";
} else if (c != ' '){
word += c;
}
left++;
}
d.push_front(word);
string ans;
while(!d.empty()){
ans = ans + d.front();
d.pop_front();
if (!d.empty()) ans = ans + " ";
}
return ans;
}
};
class Solution {
public:
string reverseWords(string s) {
stack<string> stk;
string temp, res;
istringstream ss(s);
while(ss >> temp){
stk.push(temp);
stk.push(" ");
}
if (!stk.empty()) stk.pop();
while(!stk.empty()){
res += stk.top();
stk.pop();
}
return res;
}
};