Compilare: main.cpp: In function 'void back(int, int, int)': main.cpp:33:35: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = index + 1; i < sol.size(); i++) ~~^~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:69:53: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] configCrt |= (1 << lung - 1 - l); ~~~~~~~~~^~~ main.cpp:100:53: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] configCrt |= (1 << lung - 1 - l); ~~~~~~~~~^~~ main.cpp:125:61: warning: suggest parentheses around '-' inside '<<' [-Wparentheses] configCrt |= (1 << lung - 1 - l); ~~~~~~~~~^~~