8.77.3 Can you answer these questions?

8.77.3.1 Cannot use subfigure in l4dc2023 template

https://tex.stackexchange.com/landing/r/digest?cta=question&id=665870

I am using a conference latex template fromhttps://l4dc.seas.upenn.edu/wp-content/uploads/2022/11/l4dc_2023.zip but I cannot use \subfigure here. The minimal working example (by changing the l4dc2023-... 
[subcaption]
 

asked by user8317197 https://tex.stackexchange.com/landing/r/digest?cta=user&id=285286 Score of 1

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 0

8.77.3.2 Why doesn't the hyperlink work?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=665903

When I click on the hyperlink in the table of contents it does not direct me to the "Resumo" section. How do I fix this? 
\documentclass{report} 
\usepackage[utf8]{inputenc} 
\usepackage{... 
[table-of-contents] [hyperref] [abstract] [hyperlink]
 

asked by Tigas https://tex.stackexchange.com/landing/r/digest?cta=user&id=283064 Score of 1

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 0

8.77.3.3 Widecheck with hat does not work

https://tex.stackexchange.com/landing/r/digest?cta=question&id=665667

I defined new check from the internet, and re defined hat with widehat using amsmath. But this compiles somewhat strange. My MWE is as follows: 
\documentclass{article} 
\usepackage{amsmath} 
\... 
[accents]
 

asked by Riemann https://tex.stackexchange.com/landing/r/digest?cta=user&id=285146 Score of 2