input unknown number of variables in one line(In C++) -

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I want input in the vector of countless numbers in a row. For example 3 1 1 2 here I know from first input that there are 3 numbers. But I do not know how to store 3 numbers in the next line in a vector array. Another example - 4 2 3 2 3 I want this in C ++ (vector). 

  int n, x; Std :: vector & lt; Integer & gt; V; If (std :: cin>> n) while (n--) if (std :: cin>> x) v.push_back (x); Else std :: runtime_error ("unavailable value"); else std :: runtime_error ("count count");

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