Compilare: main.cpp: In function 'int main()': main.cpp:45:19: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 45 | for( j = 0; j < strings[i].size() - 1; j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~ main.cpp:55:21: warning: comparison of integer expressions of different signedness: 'long long int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 55 | for( j = 0; j < strings[i].size() - 1; j++ ) { | ~~^~~~~~~~~~~~~~~~~~~~~~~