Compilare: main.cpp: In function 'int main()': main.cpp:109:19: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 109 | for(int i=0; i<ans.size(); i++) | ^ main.cpp:131:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 131 | for(int i=1;i<=ans.size();i++) | ^ main.cpp:144:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 144 | for(int st=1;st+dist<=ans.size();st++) | ~~~~~~~^~~~~~~~~~~~