Compilare: user.cpp: In function ‘int main()’: user.cpp:165:11: warning: unused variable ‘tmp’ [-Wunused-variable] FILE* tmp = tmpfile(); ^ user.cpp: In function ‘void read(FILE*, std::vector<std::list<node> >&)’: user.cpp:123:35: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%hd %hd ", &n, &m); ^ user.cpp:128:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%hd %hd %hd ", &x, &y, &c); ^ user.cpp: In function ‘int main()’: user.cpp:211:27: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%hd ", &k); ^ user.cpp:214:47: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(in, "%hd %hd %hd ", &x, &y, &c); ^