Borderou de evaluare (job #860019)

Compilare: main.cpp:4: warning: ignoring '#pragma GCC ' [-Wunknown-pragmas] 4 | #pragma GCC(O1) main.cpp:5: warning: ignoring '#pragma GCC ' [-Wunknown-pragmas] 5 | #pragma GCC(O2) main.cpp:6: warning: ignoring '#pragma GCC ' [-Wunknown-pragmas] 6 | #pragma GCC(O3) main.cpp: In function 'int main()': main.cpp:14:12: warning: ignoring return value of 'std::basic_ostream<_CharT, _Traits>* std::basic_ios<_CharT, _Traits>::tie() const [with _CharT = char; _Traits = std::char_traits<char>]', declared with attribute 'nodiscard' [-Wunused-result] 14 | cin.tie(); | ~~~~~~~^~ In file included from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/ios:48, from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/istream:42, from /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/fstream:42, from main.cpp:1: /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/basic_ios.h:310:7: note: declared here 310 | tie() const | ^~~ main.cpp:15:13: warning: ignoring return value of 'std::basic_ostream<_CharT, _Traits>* std::basic_ios<_CharT, _Traits>::tie() const [with _CharT = char; _Traits = std::char_traits<char>]', declared with attribute 'nodiscard' [-Wunused-result] 15 | cout.tie(); | ~~~~~~~~^~ /usr/lib/gcc/x86_64-pc-linux-gnu/15/include/g++-v15/bits/basic_ios.h:310:7: note: declared here 310 | tie() const | ^~~ main.cpp:19:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 19 | for (int i=2; i<x.size(); i++) { | ~^~~~~~~~~