Hot answers tagged two-column
3
You're overcomplicating things. You don't need floats (figure) and \caption.
Adjust the definition of \problem to suit.
Note that I didn't load graphicx because I don't have your images. Load it and, of course, remove the bogus definition of \includegraphics I added just for the example.
\documentclass[11pt,twocolumn]{article}
\usepackage[T1]{fontenc}
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