This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex 2018.4.16)  23 FEB 2021 23:23
entering extended mode
 restricted \write18 enabled.
 %&-line parsing enabled.
**curve.tex
(./curve.tex
LaTeX2e <2018-04-01> patch level 2
Babel <3.18> and hyphenation patterns for 84 language(s) loaded.
! I can't find file `../problem.tex'.
l.1 \input ../problem.tex
                         
(Press Enter to retry, or Control-D to exit)
Please type another input file name
! Emergency stop.
l.1 \input ../problem.tex
                         
*** (job aborted, file error in nonstop mode)

 
Here is how much of TeX's memory you used:
 7 strings out of 492649
 129 string characters out of 6129622
 56400 words of memory out of 5000000
 3988 multiletter control sequences out of 15000+600000
 3640 words of font info for 14 fonts, out of 8000000 for 9000
 1141 hyphenation exceptions out of 8191
 5i,0n,3p,33b,8s stack positions out of 5000i,500n,10000p,200000b,80000s
!  ==> Fatal error occurred, no output PDF file produced!