Compilare: main.cpp: In function 'bool posibil(std::__cxx11::string, std::__cxx11::string)': main.cpp:20:74: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[index] == '1' || s[index] == '2' || s[index] == '3' && index < s.length()) { ~~~~~~^~~~~~~~~~~~ main.cpp:20:65: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while(s[index] == '1' || s[index] == '2' || s[index] == '3' && index < s.length()) { main.cpp:30:108: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] while(s[s.length()-index] == '1' || s[s.length()-index] == '2' || s[s.length()-index] == '3' && index <= s.length()) { ~~~~~~~^~~~~~~~~~~~~ main.cpp:30:98: warning: suggest parentheses around '&&' within '||' [-Wparentheses] while(s[s.length()-index] == '1' || s[s.length()-index] == '2' || s[s.length()-index] == '3' && index <= s.length()) { main.cpp:39:22: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for(int i = 0; i < s.length(); i++) ~~^~~~~~~~~~~~