Question

Getting vector iterator not deferencable for code below, but I don’t see why. I am simply iterating through the 2d array and instantiating all values to 0. Where am I iterating to an invalid location?

vector<vector<bool>> isduplicate(100);

        for(int i=0;i<isduplicate.size();i++){
            for(int s=0;s<isduplicate.size();s++)
            isduplicate[i][s]=false;
        }

Answer 1

You are iterating over isduplicate twice. You should iterate over isduplicate[i] in the inner loop:

vector<vector<bool>> isduplicate(100);
for(int i=0;i<isduplicate.size();i++){
    for(int s=0;s<isduplicate[i].size();s++)
       isduplicate[i][s]=false;
} 

However, isduplicate[i] is empty for all i, therefore you won’t iterate over anything in the inner loop.

If what you want is to have 100 vectors of 100 bools containing the false value, then:

vector<vector<bool>> isduplicate(100, vector<bool>(100, false));

Should do it.