Compilare: user.cpp: In function ‘int cer2(int)’: user.cpp:31:12: warning: statement has no effect [-Wunused-value] mij+(st+dr)/2; ~~~^~~~~~~~~~ user.cpp: In function ‘int cer3(int)’: user.cpp:43:19: warning: variable ‘elem’ set but not used [-Wunused-but-set-variable] int st=1,dr=n,elem; ^~~~ user.cpp:55:1: warning: no return statement in function returning non-void [-Wreturn-type] }; ^ user.cpp: In function ‘int main()’: user.cpp:59:36: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.in","r",stdin); ^ user.cpp:60:38: warning: ignoring return value of ‘FILE* freopen(const char*, const char*, FILE*)’, declared with attribute warn_unused_result [-Wunused-result] freopen("cautbin.out","w",stdout); ^ user.cpp: In function ‘int cer2(int)’: user.cpp:32:17: warning: ‘mij’ may be used uninitialized in this function [-Wmaybe-uninitialized] if(v[mij]>x) ~~~~~^