Compilare: main.cpp: In function 'int main()': main.cpp:28:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 28 | for(int a=0; a<s[i].size(); a++) | ~^~~~~~~~~~~~ main.cpp:22:17: warning: unused variable 'x' [-Wunused-variable] 22 | int x,cont=0,nr=0; | ^ main.cpp:64:31: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 64 | for(int q=0; q<s[i].size(); q++) | ~^~~~~~~~~~~~