class Solution {
public:
string reverseWords(string s) {
int n=s.size();
int l=0,r=0;
while(l<n)
{
while(r<n && s[r]!=' ')
{
r++;
}
reverse(s.begin()+l,s.begin()+r);
l=r+1;
r=l;
}
return s;
}
};
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