Compilare: user.cpp: In function ‘int main()’: user.cpp:81:33: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (unsigned int i = 0; i < num_edges; i++) { ^ user.cpp:64:48: 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:71:41: 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); ^