What STL(C++) are essential to learn for solving problem in contests?

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I just completed my first contest on Codechef and I got one AC and one partial AC. I was going through editorials and found that every solution is using various kind of STL. I only know about vector STL in C++. What other STLs I should read about and what is the best approach to find which one I should use?

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The Complete Practical Guide to C++ STL