I'm not super familiar with modern C++ but I believe stdin's purpose is for getting input from the console/terminal. So I don't understand why you would read a file from stdin and in any case why you would redefine stdin. Maybe you're supposed to type something like this on the CLI:
myprogram < input.txt
so that file input.txt ends up in the stdin for the program? That's all I can think of.
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I'm not super familiar with modern C++ but I believe stdin's purpose is for getting input from the console/terminal. So I don't understand why you would read a file from stdin and in any case why you would redefine stdin. Maybe you're supposed to type something like this on the CLI:
myprogram < input.txtso that file
input.txtends up in the stdin for the program? That's all I can think of.