Compilare: user.cpp: In function ‘int main()’: user.cpp:73:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d%d", &n, &m); ^ user.cpp:77:34: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf (in, "%d%d", &x, &y); ^