Compilare: user.cpp: In function ‘int main()’: user.cpp:17:9: warning: unused variable ‘nrsub’ [-Wunused-variable] int nrsub=0, nrsec=0; ^ user.cpp:19:33: 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:22:30: warning: ignoring return value of ‘int fscanf(FILE*, const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] fscanf(fin, "%d", &a); ^