Compilare: main.cpp: In constructor 'Matrix::Matrix::Matrix(int, int)': main.cpp:18:12: warning: 'Matrix::Matrix::m' will be initialized after [-Wreorder] int n, m; ^ main.cpp:15:37: warning: 'std::vector<std::vector<int> > Matrix::Matrix::a' [-Wreorder] std::vector<std::vector<int > > a; ^ main.cpp:22:5: warning: when initialized here [-Wreorder] Matrix(const int _n, const int _m) : n(_n), m(_m), a(std::vector<std::vector<int > >(_n + 1, std::vector<int >(_m + 1, 0))) {} ^~~~~~ main.cpp: In function 'int main()': main.cpp:66:25: warning: ignoring return value of 'int scanf(const char*, ...)', declared with attribute warn_unused_result [-Wunused-result] int k; scanf("%d", &k); ^