Problem 2954. Best Problem Elections

When I am writing those words, there are 2002 problems on Cody. Many of them are simply wonderful. Do you remember which of them were your favorite? Vote for them!

• Write a function which returns a number of problem you wish to vote for.
• You can vote for problems created by other players.
• At first you can submit up to 10 solutions which equals 10 votes.
• When you will use 10 votes limit you will receive the opportunity to vote weekly (one vote per week, but it does not accumulate).

Other info:

• Size of your solution will be the number you submitted. It's on purpose of Trendy gathering data to make summary here.
• If you really need to be a leader, please submit 0. I don't want to favorize any problem because of its number :-)
• Please, feel free to write your memories about problems you really like. Where those most challenging, difficult or funny? I will be really happy when comments below will become a little thread about problems worthy to be memorized and really nice ones but forgotten.
• Don't forget to Like your favorite problems, if you haven't done this yet.
• Most of all: Have fun!

Temporary info (will be removed soon):

• There will be soon a plot with top 10 (or N) problems. I just have to make a trend and plot on Trendy, and I need some votes to start with.