Compilare: main.cpp: In function 'void solve2()': main.cpp:44:23: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 44 | for (int i = 0; i < numar.size(); ++i) { | ~~^~~~~~~~~~~~~~ main.cpp:45:20: warning: suggest parentheses around '&&' within '||' [-Wparentheses] 45 | if (i == 0 and numar[i] == '1' or numar[i] == '9') | ~~~~~~~^~~~~~~~~~~~~~~~~~~