Compilare: main.cpp: In function 'int main()': main.cpp:30:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 30 | for(i = 0; i < ch.size(); i++) | ~~^~~~~~~~~~~ main.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | if(i + 2 >= ch.size()) | ~~~~~~^~~~~~~~~~~~ main.cpp:47:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 47 | for(i = 0; i < ch.size(); i++) | ~~^~~~~~~~~~~ main.cpp:56:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 56 | for(i = 0; i < ans.size(); i++) | ~~^~~~~~~~~~~~