Compilare: user.cpp: In function ‘void readGraphs(std::vector<int>*, std::vector<int>*, int&, int&)’: user.cpp:29:28: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 0; i < m; i++) { ^ user.cpp: In function ‘int main(int, char**)’: user.cpp:44:29: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (size_t i = 1; i <= n; i++) { ^