[Solved] How to input to vector correctly in C++

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That’s because constructor of A is called with N=0. When you input N, it doesn’t affect the vector at all. If you really want to keep using globals, then use std::vector::resize but the recommended way would be:

int main(){
    std::size_t n;
    std::cin >> n;
    std::vector<int> A(n);
    for(auto & x : A) std::cin >> x;
}

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solved How to input to vector correctly in C++