Question: C++: why I can't use stoi() function, it keep sending me std::invalid_argument I try to read from file, turn 3 string above into integer

C++: why I can't use stoi() function, it keep sending me "std::invalid_argument"

C++: why I can't use stoi() function, it keep sending me "std::invalid_argument"I try to read from file, turn 3 string above into integer

I try to read from file, turn 3 string above into integer

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