Today,i was doing my usual stuffs,practicing for div2c in order to reach specialist on my main(i am currently 1173).I got bored so i decided to do some analysis on codedrills.After i ran the analysis,i found out that i was not that good on my early days compared to my friends.In fact,i believe i was under average.I just wondered whether i would be a red if i try hard enough in the future.
One of the struggle that i had is mentioned in the title.Another one is about vectors.i remember asking someone why i should vectors when i have a regular array.The last one is probably knapsack.i spent like 1 and a half year to just remember how to implement knapsack.Recently,i just become fluent at knapsack lol.
Also worth mentioning,i post this blog using this account because its my first account so u can immediately see what im doing in the early days.
If it actually takes you months to understand things such as knapsack or stl map usage, then you are learning them the wrong way.
Fluency, on the other hand, only comes with practice and exposure, and every once in a while, I too come across a knapsack problem that totally confounds me (Something like this).