Compilare: user.cpp: In function ‘int main()’: user.cpp:83:37: warning: format ‘%ld’ expects argument of type ‘long int’, but argument 3 has type ‘std::vector<std::pair<int, int> >::size_type {aka unsigned int}’ [-Wformat=] fprintf(fout, "%ld\n", AMA.size()); ^ user.cpp:69:48: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d", &num_nodes, &num_edges); ^ user.cpp:76:41: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d %d %d", &x, &y, &c); ^