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Codeforces

To get list of all problems there is a public api which contains problems and their related tags. https://codeforces.com/api/problemset.problems

Contests

There are two types of contests for div1 and div2 happen, div1 is for experienced uses and div1 is for uses with less experience.

You can also start virtual contest to practice any past contest. After contest is finished editorial of every coding contest are released.

In codeforces there is concept of hacking a problem. Which means finding some problem with question. You can also challenge someone solution if it showed as passed. You have to prove it wrong (by giving some testcase). A successful hack will also result in increase in your rating.

Ratings Categories

Title Rating
Newbie 0-1200
Pupil 1200-1400
Specialist 1400-1600
Expert 1600-1900
Candidate Master 1900-2100
Master 2100-2300
International Master 2300-2400
Grandmaster 2400-2600
International Grandmaster 2600-3000
Legendary Grandmaster 3000-Inf

Problem Types

Here are some tags which problems have in codeforces:

implementation math greedy dp data structures constructive algorithms brute force graphs sortings binary search dfs and similar trees strings number theory combinatorics bitmasks two pointers *special geometry dsu shortest paths divide and conquer probabilities hashing interactive games flows matrices string suffix structures fft graph matchings ternary search meet-in-the-middle expression parsing 2-sat chinese remainder theorem schedules