Compilare: user.cpp: In function ‘int deleter(int)’: user.cpp:50:6: warning: unused variable ‘prec’ [-Wunused-variable] Nod prec; ^ user.cpp: In function ‘int main()’: user.cpp:113:8: warning: unused variable ‘l’ [-Wunused-variable] int i,l,x=0,nr=0,M; ^ user.cpp:111:30: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.in","r",stdin); ^ user.cpp:112:32: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("zeap.out","w",stdout); ^ user.cpp:129:18: warning: ignoring return value of ‘int scanf(const char*, ...)’, declared with attribute warn_unused_result [-Wunused-result] scanf("%d",&x); ^