Compilare: main.cpp: In function 'int main()': main.cpp:63:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 63 | for ( int j = 0 ; j < v [ i ] .size() ; j ++ ) | ~~^~~~~~~~~~~~~~~~~ main.cpp:73:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 73 | if ( first == false && sum == v[ i ] .size() ) | ~~~~^~~~~~~~~~~~~~~~~ main.cpp:84:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 84 | for ( int j = 0 ; j < v[ i ] .size() ; j ++ ) | ~~^~~~~~~~~~~~~~~~ main.cpp:103:37: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 103 | for ( int j = 0 ; j < v [ i ] .size() ; j ++ ) | ~~^~~~~~~~~~~~~~~~~ main.cpp:113:44: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 113 | if ( first == false && sum == v[ i ] .size() ) | ~~~~^~~~~~~~~~~~~~~~~ main.cpp:124:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::vector<std::__cxx11::basic_string<char> >::size_type' {aka 'long unsigned int'} [-Wsign-compare] 124 | for ( int j = 0 ; j < v[ i ] .size() ; j ++ ) | ~~^~~~~~~~~~~~~~~~