Compilare: main.cpp: In function 'void dfs(int)': main.cpp:17:23: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (int i = 0; i < lista[nod].size() && !ok; i++) ~~^~~~~~~~~~~~~~~~~~~ main.cpp:27:34: warning: suggest parentheses around comparison in operand of '^' [-Wparentheses] if (sol[nodd] ^ sol[nod] != xxor) ~~~~~~~~~^~~~~~~ main.cpp: In function 'int main()': main.cpp:43:13: warning: unused variable 'inc' [-Wunused-variable] int inc = 1, sf = 0; ^~~ main.cpp:43:22: warning: unused variable 'sf' [-Wunused-variable] int inc = 1, sf = 0; ^~