Compilare: main.cpp: In function 'int main()': main.cpp:33:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 33 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:49:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 49 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:70:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 70 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:78:21: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 78 | if(i==s.size()-1) | ~^~~~~~~~~~~~ main.cpp:86:28: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 86 | for (int i=0; i<s.size(); i++) | ~^~~~~~~~~ main.cpp:94:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 94 | if (i==s.size()-1) | ~^~~~~~~~~~~~