lets we have
string s="" , k="abcd";
(1) s=s+a;
(2) s+=a;
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lets we have
string s="" , k="abcd";
(1) s=s+a;
(2) s+=a;
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s=s+a; creates a copy of the string so you can get MLE,
s+=a or s.append(a) doesnt creates a copy of the string.
s+=a and s=s+a aren't they same?
nope