Compilare: main.cpp: In function 'bool verif(date, date)': main.cpp:13:18: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 13 | for(int i=0;i<y.cuv.length();i++) | ~^~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:47:26: 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(int j=0;j<a[i].cuv.length();j++) | ~^~~~~~~~~~~~~~~~~~