Compilare: user.cpp: In function ‘int main()’: user.cpp:114:7: warning: unused variable ‘tstart’ [-Wunused-variable] int tstart = tv.tv_sec * 1000 + tv.tv_usec / 1000; ^ user.cpp:125:7: warning: unused variable ‘tend’ [-Wunused-variable] int tend = tv.tv_sec * 1000 + tv.tv_usec / 1000; ^ user.cpp:118:50: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d%d%d%d%d", &n, &a1, &b1, &p, &q); ^