Compilare: main.cpp: In function 'int main()': main.cpp:32:22: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(j = 0; j < v[i].size() && j < v[i-1].size();++j) | ~~^~~~~~~~~~~~~ main.cpp:32:41: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 32 | for(j = 0; j < v[i].size() && j < v[i-1].size();++j) | ~~^~~~~~~~~~~~~~~