题目描述:
Given a string, you need to reverse the order of characters in each word within a sentence while still preserving whitespace and initial word order.
Example 1:
Input: “Let’s take LeetCode contest”
Output: “s’teL ekat edoCteeL tsetnoc”
Note: In the string, each word is separated by single space and there will not be any extra space in the string.
代码实现:
class Solution {
public:
string reverseWords(string s) {
vector<int> stack;
int index = 0;
for(int i=0;i<s.length();i++){
if(s[i]!=' '){
stack.push_back(s[i]);
}else{
while(!stack.empty()){
s[index++]=stack.back();
stack.pop_back();
}
s[index++]=' ';
}
}
while(!stack.empty()){
s[index++]=stack.back();
stack.pop_back();
}
s[index++]='\0';
return s;
}
};