Question

I have a map<string,vector<string> > called dict mapping a string to a list of strings. I want to assign empty values to the values of certain keys. something like this:

else dict[words[i]]=<EMPTY VECTOR WHERE I CAN PUSH DATA LATER INTO>;

words is a vector of strings. How do I do this? Using the Standard template library of course.

Answer 1

else dict[words[i]]; should be sufficient on its own. If dict does not yet contain any element with a key equivalent to words[i], a new element will be created in dict with a copy of words[i] as the key and with a default constructed (empty) vector as the value.

If dict already contains an element equivalent to words[i], then dict will not be modified.