Compilare: main.cpp: In function 'int main()': main.cpp:20:16: warning: comparison of integer expressions of different signedness: 'int' and 'const std::__cxx11::basic_string<char>::size_type' {aka 'const long unsigned int'} [-Wsign-compare] 20 | while (pos != string::npos) | ~~~~^~~~~~~~~~~~~~~ main.cpp:26:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<int>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 26 | for(int i=0;i<app.size();i++) | ~^~~~~~~~~~~