Compilare: main.cpp: In function 'int main()': main.cpp:26:39: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int j=0; j<s.size(); j++) | ~^~~~~~~~~ main.cpp:37:31: 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<x.second.size(); i++) | ~^~~~~~~~~~~~~~~~ main.cpp:39:32: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 39 | while(i<x.second.size() && (x.second[i]>='0' && x.second[i]<='9')) | ~^~~~~~~~~~~~~~~~ main.cpp:45:29: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | if(i>=x.second.size()) | ~^~~~~~~~~~~~~~~~~ main.cpp:59:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 59 | while(i<x.second.size() && (x.second[i]>='0' && x.second[i]<='9')) | ~^~~~~~~~~~~~~~~~