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STL, Other stuff - Coggle Diagram

- - - - accumulate(first_index, last_index, initial value of sum);
        
        similarly can be used in array with
        accumulate(a, a+n, initial value of sum);
    - - myvector= {1, 2, 3, 4, 5}, iterator= 2
        
        myvector.erase(iterator);
  - - - for (auto i = m.begin() ; i != m.end() ; i++)
        cout << i->first << " " << i->second;
    - - m.empty(); returns true if empty
    - - map_name.erase(key)
        
        a note of how to use it in codeforces
        
        https://codeforces.com/problemset/submission/450/90835950