Compilare: main.cpp: In function 'char* cerinta2()': main.cpp:14:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 14 | for( int i = 2; i < a.size(); ++i ) { | ~~^~~~~~~~~~ main.cpp:19:34: warning: operation on 'poz' may be undefined [-Wsequence-point] 19 | s[ poz - 1 ] = s[ poz-- ]; | ~~~^~ main.cpp:19:34: warning: operation on 'poz' may be undefined [-Wsequence-point] main.cpp: In function 'int main()': main.cpp:37:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 37 | for( int i = 1; i <= a.size(); ++i ) { | ~~^~~~~~~~~~~