Compilare: user.cpp: In function ‘int main()’: user.cpp:63:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < g.size(); ++i){ ^ user.cpp:34:32: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &n, &k); ^ user.cpp:37:36: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d", &x, &y); ^