Compilare: main.cpp: In function 'int main()': main.cpp:72:40: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 72 | for (j = 0, poz = 0; j < v[i].size(); ++j, poz += 2) | ~~^~~~~~~~~~~~~ main.cpp:97:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 97 | for (j = 0; j < v[i].size(); ++j) | ~~^~~~~~~~~~~~~ main.cpp:120:27: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 120 | for (j = 0; j < v[i].size(); ++j) | ~~^~~~~~~~~~~~~